Make configure_neutron_nova_new and create_nova_conf_neutron param optional

The commit e95f2a36645b58b172855213cb8311a3486bfcd9 broke
networking-ovn (and potentially other ml2 drivers) by making the config
parameter mandatory. It doesn't need to be.

Change-Id: I0d5738ac3a6d27ddb7655835d77689409a6ff6f4
2 files changed