Merge branch 'stable-3.1' * stable-3.1: Upgrade bazlets to latest stable-3.1 to build with 3.1.8 API Move plugin configuration to a separate file Upgrade bazlets to latest stable-3.0 to build with 3.0.12 API Upgrade bazlets to latest stable-2.16 to build with 2.16.22 API Change-Id: Ic4e5b3bb816673183fc5dc8542546fb6936c19a8