Update Security String to 2017-05-01 on nyc-dev am: 573e7e75ca am: 368d0a8a42 am: 751d4cd04e am: f1abae80c5 am: bb49524a50 am: 73d531dec3
am: f8c1587e3d

Change-Id: Ife982a35a2236ea6c8fc7ab0376f35c7c13b513c