Remote 'delete' and 'show' features

Signed-off-by: Zack Cerza <zack.cerza@inktank.com>
Refactor teuthology.schedule...

... to separate the assembling of the job config from the scheduling of
the job. Also port its argument parsing to docopt.

Signed-off-by: Zack Cerza <zack.cerza@inktank.com>
Merge pull request #270 from ceph/wip-schedule-suite

Refactor teuthology.schedule...