Include the Python 3/3.3 trove classifiers
Include the Python 3/3.3 trove classifiers

These are often used by automated tools to check for Python 3 support.

Change-Id: I29fae2c0b80d28a865cc0972272e470da720ca11

metacloud/python-cinderclient,metacloud/python-cinderclient,swamireddy/python-cinderclient,JioCloud/python-cinderclient,scottdangelo/cinderclient-api-microversions,varunarya10/python-cinderclient,varunarya10/python-cinderclient,eayunstack/python-cinderclient,JioCloud/python-cinderclient,swamireddy/python-cinderclient,eayunstack/python-cinderclient,scottdangelo/cinderclient-api-microversions