Add teuthology-queue command for beanstalk Managmeent.

Supports listing entire queue of machine type and deleting test
suite runs from the queue without wiping the entire queue.

Signed-off-by: Sandon Van Ness <sandon@inktank.com>
Make help a bit more obvious. Misc tweeks.

Put each yaml in the job_description on its own line so not so
wide of a line. Make delete default None not False in function.

Signed-off-by: Sandon Van Ness <sandon@inktank.com>