Updated openstack/openstack
Project: openstack/nova  e309bc4e5a3173f55dfc9f21f849bbc0e0908ee6

Downgrade log level when create network failed

We raised exception when create network failed because of exceed
quota, downgrade to debug level for those exceptions because
LOG.exception will generate a stacktrace.

Change-Id: I22446f08ee078c624970f233875874a67ea423b9