[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

Change-Id: I2f1bcd2e3c7e40013769429f2214188a82cd7ae9