openstack-novalxd update ip addr selection for ext-subnet

[hmlanigan]

With recent changes to conjure-up, neither network bridge is using 10.99.0.0/24 therefore deployed openstack instances are reachable. I had to manually remove the ext-net and create a new to work with the conjureup0 bridge.

(I picked the bridge not being used by the containers deployed for the openstack)

Most noticeable when doing a juju bootstrap against a conjured-up openstack.

[battlemidget]

Yea we need to fix that, need to add the option in the post processing steps to assign correct networks

[battlemidget]

This has been addressed in candidate channel, please test against that and let us know if there are any issues