Do not use skip_checks in TestVolumeBootPattern

test_boot_server_from_encrypted_volume_luks shouldn't be
skIpped if CONF.volume_feature_enabled.snapshot is False,
so skip_checks can't be used in TestVolumeBootPattern,
instead we should use @testtools.skipUnless per testcase.

Change-Id: I8e15e4b13171990f9b16f5d00b46661e8315982f
1 file changed