Merge branch 'stable-2.16' into stable-3.0 * stable-2.16: Upgrade bazlets to latest stable-2.16 to build with 2.16.21 API Upgrade bazlets to latest stable-2.15 to build with 2.15.19 API Upgrade bazlets to latest stable-2.14 to build with 2.14.21 API Change-Id: I7107c5e49a99b7156934b9ebfee4c28a42603b3d