[DO NOT MERGE] Update Security String to 2017-04-05 on lmp-dev am: e2eff3f7ee  -s ours am: ea757ba690 am: 37aab729cf  -s ours am: 8a59a2eda2 am: 3746e17d30 am: b15a2623ac am: 4be162ac7f  -s ours am: c8b7e08b50 am: 3e0d1c32da am: 437c3dd5d3  -s ours
am: 79c6fbceef  -s ours

Change-Id: I9c5be94ecca932ecc6542a1550f79ca898f8c0d9