ANR observed under settings when trying to reset network settings

- Move reset network settings code to async task.

Test: manual, Robolectric
Fixes: 130772994
Change-Id: I59345f48ed840ecfd64c29c2c20ab8caf2679f63
Merged-In: I59345f48ed840ecfd64c29c2c20ab8caf2679f63

tests/robotests/src/com/android/settings/testutils/shadow/ShadowBluetoothAdapter.java

@@ -51,4 +51,9 @@ public class ShadowBluetoothAdapter extends org.robolectric.shadows.ShadowBlueto
     public void setConnectionState(int state) {
         mState = state;
     }
+
+    @Implementation
+    protected boolean factoryReset() {
+        return true;
+    }
 }