Add neutron plugin to octavia-dsvm-base job

With octavia_create_network_interface_device() being in
the neutron tree, we have to enable the neutron plugin
in more jobs to have it visible, else o-hm0 will not
get created and it will fail.

Moved the occurence in the ipv6-only job to the parent
definition as well.

Change-Id: I0d15dbae9034ab17de69d884e8f57df0d25d4338
1 file changed