cyverse / atmosphere / 1040 / 2

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Pull #599

travis-ci

Fix unshelved instance failing to get fixed ip

I changed the name of add_fixed_ip, because we are taking a quite different
approach here. We delete all an instance's ports, and then instruct nova to
attach the instance to a subnet. Nova takes care of creating a port.

This fixes an outstanding issue in nova[0]. Our original approach is to keep
ports around and then just update the fixed ips. However, when an instance and
its port are created, they each have an availability zone, when we unshelve an
instance its AZ may change. If it does change, openstack fails to update the
device owner AZ of the port and attaching a fixed ip fails because no ports
exist in the AZ.

https://bugs.launchpad.net/nova/+bug/1759924[0]

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