[automerger] [DO NOT MERGE] Update Security String to 2018-04-01 on mnc-dev Bug:73240847 am: e4d86d9b06
am: 83709d3152
am: 70ea788dfa
skipped: ac14372129
am: 83c448128c
Change-Id: I2bd8d8265cf136682fa5faba753979ad6ff2dda8
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