Merge branch 'stable-2.15' into stable-2.16 * stable-2.15: Upgrade bazlets to latest stable-2.15 to build with 2.15.12 API Upgrade bazlets to latest stable-2.14 to build with 2.14.19 API Change-Id: If3854f4c03574942d9534d2ec7c74f08fb0df74a