[DO NOT MERGE] Update Security String to 2017-02-01 on mnc-dev am: f92880e0c7 am: 6083d8337c am: e76d1419c7 am: 0c30223c15  -s ours am: 4758581371
am: 7ab9da0e3e

Change-Id: Icc44a43eefe8db0fcd9191b10ce6e2517ce56f99