User creation.
Now using most recent pymongo from pip.

- python-pymongo from ubuntu 14.04 repo's is too old and uses a
deprecated user schema and so it is necessary to install it from pip.
- Waits for service to startup on service activation, so that further
actions that require the service (like user management) can run with
success.
- No longer using facts for admin, now looking at mongodb_conf.auth.
- admin user has now the "root" role.
Increased service startup timeout.
Merged with current upstream.