Add oslo.rootwrap to the integrated gate
Add oslo.rootwrap to the integrated gate

oslo.rootwrap recently graduated but was not made part of the
devstack-gate. This change is part of a series of changes affecting
devstack-gate, config and devstack which will collectively fix this:

https://review.openstack.org/#/q/status:open+topic:rootwrap-gate,n,z

This change adds the integration tests to the oslo.rootwrap list of
tests.

Change-Id: I5d1ebfa78f3008112e953919f6ad05972602177f

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