[DO NOT MERGE] Update Security String to 2017-04-05 on lmp-dev am: e2eff3f7 ...

[DO NOT MERGE] Update Security String to 2017-04-05 on lmp-dev am: e2eff3f7  -s ours am: ea757ba6 am: 37aab729  -s ours am: 8a59a2ed am: 3746e17d am: b15a2623 am: 4be162ac  -s ours am: c8b7e08b am: 3e0d1c32 am: 437c3dd5  -s ours am: 79c6fbce  -s ours
am: caf20624  -s ours

Change-Id: I283004995732f715c1eda65debbf245edd4837c7