Upgrade bazlets to latest stable-3.1 to build with 3.1.6 API
Upgrade bazlets to latest stable-3.1 to build with 3.1.6 API

Change-Id: I3f3be77b67809dd28499e47b635375689084e56d

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