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: I5e7a2a9ea69d67d06ff90ddd705b99fc16c79ab8

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