[DO NOT MERGE] Update Security String to 2017-04-01 on lmp-dev am: ffab69998a  -s ours am: 0f30aa9801 am: 05ebddebe5  -s ours am: 101c043b17
am: 58086ff4aa

Change-Id: Ia7831d78a8cb2f0604051b5297b2f3236e1ae36f