16.1: Fix ovn functional target
16.1: Fix ovn functional target

There are some packages that are not needed for 16.1 target and are not
even available. Specifically python3-tox, bridge-utils and python3-ryu.
Neither is used.

Change-Id: I411794d6b039d8fcb0a33dbe6a0a63be1553956c

redhat-openstack/octario,redhat-openstack/octario