Add NetApp Cinder backend support

Supports both iSCSI and NFS

Change-Id: If590a7a255268fcce4770c94956607251c36fdf5
Merge branch 'local-vars-ldap' into dt-test
Merge branch 'local-vars-neutron' into dt-test
Merge branch 'cinder-backend-netapp' into dt-test
Merge branch 'erlang-b-gone' into dt-test
Merge branch 'conf-tempest' into dt-test
Merge branch 'test-service-functions' into dt-test
Merge branch 'exercise-refresh' into dt-test