update mysql-sandbox command docstring
relax sandbox.sh privileges to the more standard 0755
make is_tarball check use tarfile.is_tarfile

- previously this did a poorly implemented check on the file suffix
  but now this uses tarfile.is_tarfile to check if this is actually
  supported by python tarfile, since that's ultimately the
  implementation used under the hood here.
add timing information to --data tarball extractions
convert _is_required to a simple regex

- previously was a list of glob patterns
fix various >80 char lines in datasource.py
sandbox.sh cleanups

- make condrestart/try-restart follow fedora logic better
- $0 -> $NAME in usage for cleaner output
- add additional supported action to 'Usage:'' line