Add EAP/802.1X configuration for WiFi Setting.

1. Remove the isEnterprise() filter in Scanresult.
2. This requires the new fields such as identity, eap, certificate/key
to support EAP authentication in Wifi Settings.
3. Add simple file-based keystore to select the cert/key from UI.

-- Updated from the comments.
-- Fix the bug for passing null pointer for adding spinner items.
diff --git a/res/layout/wifi_ap_configure.xml b/res/layout/wifi_ap_configure.xml
index d786cff..ecd6337 100644
--- a/res/layout/wifi_ap_configure.xml
+++ b/res/layout/wifi_ap_configure.xml
@@ -24,11 +24,17 @@
             android:padding="8dip"
             android:orientation="vertical"> 
     
-    
+            <LinearLayout
+                android:id="@+id/table"
+                android:layout_width="fill_parent"
+                android:layout_height="fill_parent"
+                android:orientation="vertical">
+            </LinearLayout>
+
     
         <!-- SSID -->
     
-        <TextView
+        <TextView android:id="@+id/ssid_text"
                 style="?android:attr/textAppearanceSmallInverse"
                 android:layout_width="fill_parent"
                 android:layout_height="wrap_content"
@@ -44,7 +50,7 @@
     
         <!-- Security -->
         
-        <TextView
+        <TextView android:id="@+id/security_text"
                 style="?android:attr/textAppearanceSmallInverse"
                 android:layout_width="fill_parent"
                 android:layout_height="wrap_content"
@@ -55,9 +61,94 @@
         <Spinner android:id="@+id/security_spinner"
                 android:layout_width="fill_parent"
                 android:layout_height="wrap_content" />
-                
-                
-        
+
+        <!-- Enterprise Fields -->
+        <LinearLayout android:id="@+id/enterprise_wrapper"
+            android:layout_width="fill_parent"
+            android:layout_height="wrap_content"
+            android:padding="8dip"
+            android:orientation="vertical">
+                <TextView android:id="@+id/eap_text"
+                        style="?android:attr/textAppearanceSmallInverse"
+                        android:layout_width="fill_parent"
+                        android:layout_height="wrap_content"
+                        android:layout_marginTop="8dip"
+                        android:text="@string/please_select_eap" />
+                <Spinner android:id="@+id/eap_spinner"
+                        android:layout_width="fill_parent"
+                        android:layout_height="wrap_content" />
+                <TextView android:id="@+id/phase2_text"
+                        style="?android:attr/textAppearanceSmallInverse"
+                        android:layout_width="fill_parent"
+                        android:layout_height="wrap_content"
+                        android:layout_marginTop="8dip"
+                        android:text="@string/please_select_phase2" />
+                <Spinner android:id="@+id/phase2_spinner"
+                        android:layout_width="fill_parent"
+                        android:layout_height="wrap_content" />
+
+                <TextView android:id="@+id/identity_text"
+                        style="?android:attr/textAppearanceSmallInverse"
+                        android:layout_width="fill_parent"
+                        android:layout_height="wrap_content"
+                        android:layout_marginTop="8dip"
+                        android:text="@string/please_type_identity" />
+                <EditText android:id="@+id/identity_edit"
+                        android:layout_width="fill_parent"
+                        android:layout_height="wrap_content"
+                        android:layout_marginTop="2dip"
+                        android:singleLine="true" />
+                <TextView android:id="@+id/anonymous_identity_text"
+                        style="?android:attr/textAppearanceSmallInverse"
+                        android:layout_width="fill_parent"
+                        android:layout_height="wrap_content"
+                        android:layout_marginTop="8dip"
+                        android:text="@string/please_type_anonymous_identity" />
+                <EditText android:id="@+id/anonymous_identity_edit"
+                        android:layout_width="fill_parent"
+                        android:layout_height="wrap_content"
+                        android:layout_marginTop="2dip"
+                        android:singleLine="true" />
+                <TextView android:id="@+id/client_certificate_text"
+                        style="?android:attr/textAppearanceSmallInverse"
+                        android:layout_width="fill_parent"
+                        android:layout_height="wrap_content"
+                        android:layout_marginTop="8dip"
+                        android:text="@string/please_select_client_certificate" />
+                <Spinner android:id="@+id/client_certificate_spinner"
+                        android:layout_width="fill_parent"
+                        android:layout_height="wrap_content" />
+                <TextView android:id="@+id/ca_certificate_text"
+                        style="?android:attr/textAppearanceSmallInverse"
+                        android:layout_width="fill_parent"
+                        android:layout_height="wrap_content"
+                        android:layout_marginTop="8dip"
+                        android:text="@string/please_select_ca_certificate" />
+                <Spinner android:id="@+id/ca_certificate_spinner"
+                        android:layout_width="fill_parent"
+                        android:layout_height="wrap_content" />
+                <TextView android:id="@+id/private_key_text"
+                        style="?android:attr/textAppearanceSmallInverse"
+                        android:layout_width="fill_parent"
+                        android:layout_height="wrap_content"
+                        android:layout_marginTop="8dip"
+                        android:text="@string/please_select_private_key" />
+                <Spinner android:id="@+id/private_key_spinner"
+                        android:layout_width="fill_parent"
+                        android:layout_height="wrap_content" />
+                <TextView android:id="@+id/private_key_passwd_text"
+                        style="?android:attr/textAppearanceSmallInverse"
+                        android:layout_width="fill_parent"
+                        android:layout_height="wrap_content"
+                        android:layout_marginTop="8dip"
+                        android:text="@string/please_type_private_key_passwd" />
+                <EditText android:id="@+id/private_key_passwd_edit"
+                        android:layout_width="fill_parent"
+                        android:layout_height="wrap_content"
+                        android:layout_marginTop="2dip"
+                        android:singleLine="true" />
+        </LinearLayout>
+
         <!-- Password -->
         
         <TextView android:id="@+id/password_text"