Add post deploy neutron config

Adding post deploy neutron config. Config is set to default
devtest, utill we will be able to store it to tuskar params.

Depends on os-cloud-config-patch:
https://review.openstack.org/#/c/116861/

Change-Id: I720c8c8dbe313b88c39af45ef11cdb5db787ca73
Merge "Add post deploy neutron config"