tests: ceph multicluster tests to wait for one cluster at a time
tests: ceph multicluster tests to wait for one cluster at a time

The two clusters were being created in parallel by the tests
and sometimes causing the test to timeout. The operator handles
the cluster serially so we don't gain anything by starting
them asynchronously. With this change the tests will be started
serially to match the behavior of the operator and avoid
the issues with test timeouts.

Signed-off-by: travisn <a8b474fdb3f77f44446f0ab9ddca8147b09b3a9e@redhat.com>

rook/rook,rook/nfs,rook/rook,rook/rook,rook/rook,rook/nfs,rook/rook,rook/nfs