Use Neutron in Horizon integration tests job
Use Neutron in Horizon integration tests job

Currently, gate-horizon-dsvm-integration job usee Nova Network
instead of Neutron.
Since the integration tests are also planned to test Neutron's
networking features within Horizon it only makes sense that Neutron
will be deployed.

Partially implements blueprint: selenium-integration-testing
Closes-Bug: #1425882

Change-Id: Ib4c4841521ea442b7430b9d24f45743bac491c7d

dongwenjuan/project-config,citrix-openstack/project-config,openstack-infra/project-config,coolsvap/project-config,noorul/os-project-config,dongwenjuan/project-config,Tesora/tesora-project-config,open-switch/infra_project-config,coolsvap/project-config,citrix-openstack/project-config,Tesora/tesora-project-config,anbangr/osci-project-config,openstack-infra/project-config,open-switch/infra_project-config,noorul/os-project-config,anbangr/osci-project-config