Add an exit statement in github-jobs.bat.tpl
Add an exit statement in github-jobs.bat.tpl

This can avoid the bazel function get exectuted again
See: http://ci.bazel.io/job/bazel-tests/BAZEL_VERSION=HEAD,PLATFORM_NAME=windows-x86_64/310/console

Change-Id: I10dce2c4db616ef3a85d50efd8d9708e783b961d

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