Add and remove DeviceInitializer from whitelist

Add the DeviceInitializer to the locktask whitelist when set or when a
new user is created. Remove DeviceInitializer from whitelist when
user setup complete.

Fixes bug 20267837.

Change-Id: I8a33bceb6e6f3d0316a1227b2ed2b713f4ca3a9e
1 file changed