Update Security String to 2017-05-05 on nyc-dev am: cfdcc41cd7 am: d5894faefd am: f773f981bb am: b7baf15d67 am: 5ce9447af1
am: a75eb481bf

Change-Id: I1bc5a195daaff9997e1f58004b5eb6e4a55c4218