Upgrade bazlets to latest stable-2.16 to build with 2.16.8 API
Upgrade bazlets to latest stable-2.16 to build with 2.16.8 API

Change-Id: I3d9df4a49cf3e255cda6ea75649dca49eb6db25b

GerritCodeReview/plugins_admin-console,GerritCodeReview/plugins_admin-console,GerritCodeReview/plugins_admin-console