DO NOT MERGE : Update Security String to 2017-05-01 on lmp-dev am: e0b38c6277  -s ours am: 637f66925f am: 3481be638f  -s ours am: d4f9e95f7c am: 6962385144 am: 128b958afb
am: 43cbfe0486  -s ours

Change-Id: Iee5da90d3503c3822d433d76d86e6aba50b37b8d