Skip fullstack L3 HA test
Skip fullstack L3 HA test

It's failing because of a known issue, being handled in:
https://review.openstack.org/#/c/285480/. That patch will
unskip the test as part of the fix.

Apart from this test, there's also a known failure in LB
tests, being handled here:
and https://review.openstack.org/#/c/294798/

I'm not aware of any other failure modes for fullstack.
With these two patches merged, we can observe the fullstack
job failure rate and hopefully make it voting.

Change-Id: I6ea3292605d25848911a2d51c996d10ecd48bf9e
(cherry picked from commit d6fb0c46bdf238b2b21761e979198388a0446149)

cloudbase/neutron,MaximNevrov/neutron,openstack/neutron,openstack/neutron,bigswitch/neutron,mahak/neutron,klmitch/neutron,eayunstack/neutron,mahak/neutron,MaximNevrov/neutron,sebrandon1/neutron,cloudbase/neutron,huntxu/neutron,igor-toga/local-snat,igor-toga/local-snat,mahak/neutron,klmitch/neutron,huntxu/neutron,noironetworks/neutron,bigswitch/neutron,openstack/neutron,noironetworks/neutron,sebrandon1/neutron,eayunstack/neutron