Prepare to make SubscriptionManager public.

Sync SubscriptionManager and its dependentes between lmp-dev
and lmp-sprout-dev.

In SubscriptionManager and SubscriptionController:
-Rename getActivatedSubInfoList to getActiveSubInfoList.
-Remove context as a parameter
-Cleanup

Change-Id: Ie06ced3e7ff5a3d06b3b47892fed22b4bb8972c7