Add docstrings to the orchestra code.  Also fix minor formatting issues
(mostly column start locations).

Fixes: 7003
Signed-off-by: Warren Usui <warren.usui@inktank.com>
Fix syntax error in first docstring added.
Merge pull request #195 from ceph/wip-7003-wusui

Add docstrings to the orchestra code.  Also fix minor formatting issues