Skip some tests when cinder is not enabled

test_delete_server_while_in_attached_volume:
    Skip when cinder is not enabled.
ServerRescueTestJSON:
    No test access the volume resource_setup creates, so stop creating one.
ServerRescueNegativeTestJSON:
    Move volume creation into tests that use it and skip them when cinder
    is not enabled.

Change-Id: Ibf58d19d72b762198de8cf6838bbabb3a4c5bad4