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
Merge branch 'master' into improve-rose.config_tree