Add the jenkins master to the correct instances group
Add the jenkins master to the correct instances group

So we do not turn down CI by reimaging the master.

Issue #140.

Change-Id: I1fd1f231f028a8c0a785395cbcdab97493d25b53

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