because crimson is released yet, it does not make sense to run seaetar
based tests in LTS branches.
Signed-off-by: Kefu Chai <kchai@redhat.com>
Conflicts: this change is not cherry-picked from master. as explained
in the commit message above. we need to use these seastar based
tests to verify that the crimson facilities are not broken in master.
but it does not help to run them in nautilus.