[DO NOT MERGE] Update Security String to 2017-04-01 for mnc-dev am: 06a57496e6
am: a3e5f184eb
am: 775af5ae5b
am: 6ebebd3ee3
-s ours am: 8dd075b1c0
am: 89005ae01c
am: dc8df2ef3d
Change-Id: Ib2091b976928701ab6c8c3e5195c61546a6f41dc
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