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: I8587c3e5ff3dbf5f23d09a5fd49b2c55c2ef7657
Merge "Skip some tests when cinder is not enabled"