networking-generic-switch-dsvm: Enable q-l3
networking-generic-switch-dsvm: Enable q-l3

The configuration of the jos seems inconsistent; it configures
the l3 service plugin [1] but nothing which provides datapath support.

This commit fixes the inconsistency by enabling q-l3.
An alternative would be to disable the l3 service plugin,
but there seems no convenient way to stop devstack ml2 from
configuring l3 service plugin.

The issue has been exposed by https://review.openstack.org/#/c/318145/ .

[1] neutron.services.l3_router.l3_router_plugin.L3RouterPlugin

Change-Id: I219eeacf3071a7016e8ca67a29a0444905b7002a

Tesora/tesora-project-config,dongwenjuan/project-config,openstack-infra/project-config,Tesora/tesora-project-config,dongwenjuan/project-config,openstack-infra/project-config