Update Security String to 2017-05-05 on nyc-dev am: cfdcc41cd7 am: d5894faefd am: f773f981bb am: ad8cf29586 am: f9b4cfca80
am: 7e6be015b6

Change-Id: Ifb32fd4a8f52ebb875622b6e2645f8be836a2ae6