This adds more SLURM and pbs tests.
fix running-loadleveler timeout
Merge pull request #1215 from benfitzpatrick/test.slurm-and-pbs

Add SLURM and pbs tests.
job poll callback: process only the relevant line

This change ensures that only the relevant line is processed. E.g. If we
use a login shell to call cylc on a remote job host, we can end up with
garbage in the output.
Merge pull request #1230 from matthewrmshin/only-process-poll-line

job poll callback: process only the relevant line