Merge branch 'stable-3.1' into stable-3.2 * stable-3.1: Upgrade bazlets to latest stable-3.1 to build with 3.1.8 API 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: Ia85c95a20f415274a51ae4a13816affef1e6be4e