CBQE-0: run_job_linux print what VMS ARE UNAVAILABLE

Change-Id: Ib71dc49a64307bb6d63832cdd7fed7f924b3f543
Reviewed-on: http://review.couchbase.org/40757
Tested-by: buildbot <build@couchbase.com>
Reviewed-by: Andrei Baranouski <andrei.baranouski@gmail.com>