DO NOT MERGE : Update Security String to 2017-05-01 on lmp-dev am: e0b38c62 ...

DO NOT MERGE : Update Security String to 2017-05-01 on lmp-dev am: e0b38c62  -s ours am: 637f6692 am: 3481be63  -s ours am: d4f9e95f am: 69623851 am: 128b958a am: 43cbfe04  -s ours am: 0086be34 am: 6af20067 am: ea8a508c  -s ours am: a981ae12  -s ours am: 5df927b1  -s ours am: dfa2a291  -s ours
am: 52a64b19  -s ours

Change-Id: Ic18af1f97139605945cb9ed6adbfb48faad75a7b