Upgrade bazlets to latest stable-2.16 to build with 2.16.1 API
Upgrade bazlets to latest stable-2.16 to build with 2.16.1 API

Change-Id: I1be9c146e28aa131f96462be81bbe3846ef2debf

GerritCodeReview/plugins_delete-project,GerritCodeReview/plugins_delete-project,GerritCodeReview/plugins_delete-project,GerritCodeReview/plugins_delete-project