Update the text shown when admin disabled fingerprint as unlock option.

When the admin has disabled fingerprint as unlock option, we let the
user know that the admin has disabled that option with a more details
link which will trigger the admin support dialog. And made some small
fixes apart from this.

Change-Id: I01021b952dc6fb29a65d37401a6411a6088d5cef
diff --git a/src/com/android/settings/SettingsPreferenceFragment.java b/src/com/android/settings/SettingsPreferenceFragment.java
index 4f81a38..c1e8d35 100644
--- a/src/com/android/settings/SettingsPreferenceFragment.java
+++ b/src/com/android/settings/SettingsPreferenceFragment.java
@@ -62,6 +62,9 @@
 
     private String mHelpUri;
 
+    private static final int ORDER_FIRST = -1;
+    private static final int ORDER_LAST = Integer.MAX_VALUE -1;
+
     // Cache the content resolver for async callbacks
     private ContentResolver mContentResolver;
 
@@ -235,7 +238,7 @@
 
     protected void setHeaderView(int resource) {
         mHeader = new LayoutPreference(getPrefContext(), resource);
-        mHeader.setOrder(-1);
+        mHeader.setOrder(ORDER_FIRST);
         if (getPreferenceScreen() != null) {
             getPreferenceScreen().addPreference(mHeader);
         }
@@ -255,7 +258,7 @@
         }
         if (footer != null) {
             mFooter = footer;
-            mFooter.setOrder(Integer.MAX_VALUE);
+            mFooter.setOrder(ORDER_LAST);
             if (getPreferenceScreen() != null) {
                 getPreferenceScreen().addPreference(mFooter);
             }