Tabletize Device administrator screen and fix the layout for DeviceAdminAdd.

Bug: 3376986

Convert the DeviceAdminSettings screen to a fragment, remove fat titlebar.
Convert the DeviceAdminAdd screen to layout nicely in the new holo DialogWhenLarge
style.

Change-Id: I20a9d16aed135a2178969dfff807075b0b79237c
8 files changed