docopt was creating a --lock) param; fix the docstring so that doesn't happen

Signed-off-by: Andrew Schoen <aschoen@redhat.com>
write a test for teuthology.run that makes sure that all fields needed in fake_ctx for the tasks to operate are present

Signed-off-by: Andrew Schoen <aschoen@redhat.com>
Merge pull request #385 from andrewschoen/run-test

a test to make sure that fake_ctx has everything it needs in teuthology.run