There are chances that innocent namespaces got banned with actually
harmful namespace, and since innocent namespaces' flags may not be
changed for a long time, they are getting banned on the devices for a
long time even though they are not problematic.
Thus we want to do: When a namespace's configuration got successfully updated, unban ALL the
banned namespaces(by clearing the hashcode map) if the updated namespace was banned before updated.
Bug: 153010388
Test: atest DeviceConfigTest & local device with Mob Dog
Change-Id: I61b92a09d77ef1e1b7bc9c86f6655ba62a8a3d89
f305f8a9f6