Remove cinder v1 artifacts from code base

Following Tempest's removal of Cinder v1 [0], Patrole should do
the same by removing any support for v1 from the code base.

[0] https://review.openstack.org/#/c/446233/

Change-Id: Ia27d7b9c19f7c53dd5605dea8f77a02251a0ab38
1 file changed