qa: disable quota tests in multimds

Quotas don't work with kclient, and multimds tasks
are run against kclient.  We don't need to run this
against fuse here because it's a basic correctness
test that's run against fuse in the fs suite.

Fixes: http://tracker.ceph.com/issues/18600
Signed-off-by: John Spray <john.spray@redhat.com>

qa/suites/multimds/basic/tasks/cfuse_workunit_quota.yaml

@@ -1,12 +0,0 @@
-tasks:
-- workunit:
-    timeout: 6h
-    clients:
-      all:
-        - fs/quota
-
-overrides:
-  ceph:
-    conf:
-      client:
-        client quota: true