Nexus: Clean up supplicant events, protocol, and continue plumbing

    - Create SupplicantEvent classes for events
    - New SupplicantEventFactory for creating events
    - Extract Controller -> NetworkManager callbacks into IControllerHandler
    - Move ScanResult handling from Supplicant -> WifiController
    - Plumb more 'onConnected()' code
    - Instead of re-creating NetworkList every-time, merge in
      new entries
    - Extract SupplicantListener -> Supplicant callbacks into
      ISupplicantEventHandler
    - Move SupplicantListener callback handling to WifiController
    - Add unlocked version of lookupNetwork()
    - Save supplicant config after setting a WifiNetwork variable
    - Move property registration from WifiNetwork -> Supplicant
    - Change wifi enable broadcast messages
    - Add 3 new events: 'onAssociating', 'onAssociated', 'onConnectionTimeout'
    - Add support for handling KeyManagement

Signed-off-by: San Mehat <san@google.com>
diff --git a/nexus/PropertyManager.cpp b/nexus/PropertyManager.cpp
index 3366bab..6faf9b8 100644
--- a/nexus/PropertyManager.cpp
+++ b/nexus/PropertyManager.cpp
@@ -37,7 +37,8 @@
     for (it = mPropertyPairs->begin(); it != mPropertyPairs->end(); ++it) {
         if (!strcmp(name, (*it)->getName())) {
             errno = EADDRINUSE;
-            LOGE("Failed to register property (%s)", strerror(errno));
+            LOGE("Failed to register property %s (%s)",
+                 name, strerror(errno));
             pthread_mutex_unlock(&mLock);
             return -1;
         }