Switch to testenv:functional for dsvm-ansible-functional
Switch to testenv:functional for dsvm-ansible-functional

The main reason for this, when we added ansible into the gate name we
passed the 125 char interrupter limit that tox supports.  Which broke
gate-ansible-role-jenkins-job-builder-dsvm-ansible-functional-centos7.

This actually brings tox.ini inline with other openstack projects.

[1] http://logs.openstack.org/98/259498/1/check/gate-ansible-role-jenkins-job-builder-dsvm-ansible-functional-centos7/46e396f/console.html

Change-Id: I376e51824c46f9b5eb4a4cff01aaa176632087dd
Signed-off-by: Paul Belanger <e7139c8e6c4ea75cc1c287ce081b2dc0f3ab39ec@redhat.com>

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