Updated openstack/openstack
Project: openstack/nova  a7f2d0bdf20ad70216cf2579e77bb2696406a669
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Catch NotImplementedError for vnc in the api

When a driver doesn't provide VNC consoles, it will raise
NotImplementedError back up to the API.  Catch this and return a 501.

Change-Id: I6b38be2b3b46dbaecfdb42ea9a139e3b691de193