[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

Change-Id: If5eb4d814e848612bea0d801df053510e57ae303