porting teuthology-coverage to docopt

Signed-off-by: Andrew Schoen <aschoen@redhat.com>
cleaning up usage for teuthology-coverage

Signed-off-by: Andrew Schoen <aschoen@redhat.com>
added a test to make sure docopt was parsing things correctly for teuthology-coverage

Signed-off-by: Andrew Schoen <aschoen@redhat.com>
refactored teuthology.coverage to use an dict from docopt instead of a namespace from argparse

Signed-off-by: Andrew Schoen <aschoen@redhat.com>
added a simple test for teuthology.coverage.main

Signed-off-by: Andrew Schoen <aschoen@redhat.com>
added a simple test for teuthology.coverage.main

Signed-off-by: Andrew Schoen <aschoen@redhat.com>
Merge pull request #358 from andrewschoen/docopt-porting

porting teuthology-coverage to docopt