Fix neutron agent ml2 ovs tests
Fix neutron agent ml2 ovs tests

With the merging of I48c81b9987935c848009b4bf3ed010c70ab1a404 in
puppet-vswitch, we are doing additional version checking for Debian
systems. This change updates the neutron::agents::ml2::ovs tests to use
rspec-puppet-facts so that we no longer get a failure for unsupported
debian OS.

Change-Id: I541ce929b96e601c62e7a121b420fdbab3e7aefb

openstack/puppet-neutron,CiscoSystems/puppet-neutron,CiscoSystems/puppet-neutron,fuel-infra/puppet-neutron,openstack/puppet-neutron,fuel-infra/puppet-neutron,CiscoSystems/puppet-neutron,fuel-infra/puppet-neutron