Updated openstack/openstack
Project: openstack/nova  a7cefc786cb1b4b48cfebc7fab4d270c8ab3996d
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Catch InstanceNotFound exceptions for V2 API floating_ips

Adds handling of InstanceNotFound exceptions in the V2 API
floating_ips extension and translate them to HTTPNotFound rather
than letting them propogate and causing a traceback in the logs

Co-Authored-By: Michael Still <mikal@stillhq.com>

Change-Id: Idc1a5b2e6b8cb9778d032e5e1fc8112a65fc225c
Closes-Bug: 1271047