Vagrant fix

Wanted to try your method to install OpenStack but only have VirtualBox available to me at the moment. I've gotten a lot of it working now but is not completely without errors. 

```
./bin/run_vagrant.sh standard
```
I need to get this work next...
```
TASK: [cinder-volume | cinder volume group] ***********************************
failed: [compute1] => {"failed": true, "parsed": false}
invalid output was: SUDO-SUCCESS-dcpftkilzppyuyegxgrupnmesxdcavtv
/home/vagrant/.ansible/tmp/ansible-tmp-1406857372.92-244680026450599/cinder_volume_group:94: syntax error, unexpected $end, expecting keyword_end


FATAL: all hosts have already failed -- aborting
```
Was there a problem with the ovs_bridge library?

`ovs-vsctl  --may-exist add-br br-int` is cleaner but always reports state as changed.