Remove unused "import sys"
Remove unused "import sys"

Cleaning up with pyflakes.

Change-Id: I24878f1bb1693af13b2a7f0f7d6fe455f8747e91

scottdangelo/cinderclient-api-microversions,scottdangelo/cinderclient-api-microversions,varunarya10/python-cinderclient,ntt-sic/python-cinderclient,varunarya10/python-cinderclient,eayunstack/python-cinderclient,ntt-sic/python-cinderclient,metacloud/python-cinderclient,JioCloud/python-cinderclient,swamireddy/python-cinderclient,citrix-openstack-build/python-cinderclient,citrix-openstack-build/python-cinderclient,swamireddy/python-cinderclient,eayunstack/python-cinderclient,metacloud/python-cinderclient,JioCloud/python-cinderclient