CMAS opt-out setting does not work when switching from Secondary user to Device owner.

Fix includes:
(1) Only device owner is alloed to set/change preference
(2) CBS intents are sent to all users
(3) Cell broadcast alter is only displayed on the active user
(4) Cell broadcast messages are saved in all users' mail box
(5) Cell broadcast test app send intents to all users
(6) Remove airplane mode trigger cellbroadcast MID configure. This should
    be taken care of by ServiceStateChange.

Bug:18223949
Change-Id: I85a2c1e4405d053de664972f2ec877f5e83548b3