Support EXTRA_DEVICE_PASSWORD_REQUIREMENT_ONLY

When set, only enforce password requirement explicitly set device-wide.

As part of the change, restructure the code such that ChooseLockGeneric
becomes the central place for aggregating password requirements from
different parties, while ChooseLockPassword only enforces whatever
password reuirement it is told (by ChooseLockGeneric via intent extras)

Bug: 169832516
Test: m RunSettingsRoboTests ROBOTEST_FILTER=com.android.settings.password

Change-Id: I0acbea4819c13d4a8444c7b06928baccead18837

src/com/android/settings/password/ChooseLockSettingsHelper.java

@@ -99,6 +99,12 @@ public final class ChooseLockSettingsHelper {
      */
     public static final String EXTRA_KEY_ALLOW_ANY_USER = "allow_any_user";
 
+    /**
+     *
+     */
+    public static final String EXTRA_KEY_DEVICE_PASSWORD_REQUIREMENT_ONLY =
+            "device_password_requirement_only";
+
     @VisibleForTesting @NonNull LockPatternUtils mLockPatternUtils;
     @NonNull private final Activity mActivity;
     @Nullable private final Fragment mFragment;