Add a step to notify by mail about build status
Add a step to notify by mail about build status

That should allow us to customize the way we do
notification about build status in the future.

Change-Id: Ia3d1caaf84754a495034950491c82b4d905f8858

bazelbuild/continuous-integration,bazelbuild/continuous-integration,bazelbuild/continuous-integration,bazelbuild/continuous-integration,bazelbuild/continuous-integration,bazelbuild/continuous-integration,bazelbuild/continuous-integration,bazelbuild/continuous-integration