Add explicit return False to dockerio __virtual__ function
Removed docs for lxcdocker execution and state modules
Updated a few remaining "lxcdocker" references to just "docker"
Added docker execution and state modules to docs
Collection o' rST changes to the docker module docstrings
Merge pull request #7884 from whiteinge/docker-mod-fixes

Bunch of misc. fixes and updates to the new docker modules