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: I2d5ebe5d9a67ec6aff7b2e1089769b3424979d58