rose bush cycles: print each cycle's last activity
rose suite-clean --only=GLOBS

New `--only=GLOBS` option to restrict items to be cleaned.
Improve diagnostic.

rose test battery: use number of processors as number of jobs.
Merge pull request #1371 from matthewrmshin/rose-suite-clean-only-share-work

rose suite-clean --only=GLOBS
rose bush: fix jobs list

Broken since cylc/cylc#1012.
Merge pull request #1372 from matthewrmshin/fix-rose-bush-jobs-mp

rose bush: fix jobs list
Update for pre-release
Merge pull request #1370 from matthewrmshin/rose-bush-cycles-last-seen

rose bush cycles: print each cycle's last activity
t/rose-app-upgrade/06-broken.t: now more robust

A left over `*.pyc` created at the beginning of the test file could
cause the final tests to fail.

Also removed some carriage return characters.
Merge pull request #1373 from matthewrmshin/fix-t-app-upgrade-06

t/rose-app-upgrade/06-broken.t: now more robust
rose host-select: improve performance

Don't SSH all hosts if ranking method is random and there is no
thresholds to consider. Shuffle host list, and return 1st available
host.