* A user can access glanceclient.__version__ to get a string
representing the version of the installed library.
* Add openstack-common's 'version' module.
Change-Id: Ib14c561d8ac0b126617a20acfbd5fdb61c54f2c7
Copied mostly from python-keystoneclient with
some Glance-specific stuff. README.rst shows what
WILL be the way to do things, not what is currently coded :)