Description of problem:
When Neutron is disabled and using Nova networking, you cannot log into a Nova virtual machine using an injected SSH key.

Version-Release number of selected component (if applicable):


How reproducible:
Always in my setup.

Steps to Reproduce:
1. Follow RDO quickstart instructions and generate an answer file
2. Set CONFIG_NEUTRON_INSTALL=n
3. packstack --answer-file ans.txt
4. nova keypair-add openstack > openstack.pem
5. nova boot --image cirros --flavor 1 --key-name openstack test
6. ssh cirros@[ip]

Actual results:
Public key authentication failed

Expected results:
Successful login

Additional info:
Even though Neutron is disabled, the Neutron config option service_metadata_proxy=True is still set in /etc/nova/nova.conf. This prevents the instances from successfully reaching the metadata server, thus preventing them from getting an injected SSH key.

I didn't see service_metadata_proxy set anywhere in Packstack, so it may need to be added.