tempest: Skip QoS test until fixed

The test is failing intermittently. In order to reach a better stability
of the job running in-tree tempest tests, this patch skips the test
until we come up with a proper fix.

Change-Id: I37f1488db258f6a4d383fb472cb5433c65371ac5
Related-bug: 1662109
1 file changed
tree: 3162df5db0a1dd56fb71783f04d7ce57b5ca1a5d
  1. neutron/