Merge branch 'stable-2.15' into stable-2.16 * stable-2.15: 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: Ic9f77a4dafcc7b5debe8ac4f18d54dfa2d950e10