Remove attach/detach code from cinderclient
Remove attach/detach code from cinderclient

Attach and Detach actions are done in the novaclient, however
during the creation of Cinder a number of these methods were copied into
the Cinder client.  This is dead code and just adds confusion, so let's
rip it out.

Change-Id: Ib96fe0cac26f19e7d9f2aa01c71ba9762e4f8b8e
Fixes: bug #1071003

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