Use consoleauth rpcapi in nova-novncproxy.
Use consoleauth rpcapi in nova-novncproxy.

The nova-novncproxy service was using rpc.call directly when it should
have been going through the rpcapi client proxy class.  This patch fixes
that.

Fix bug 1067858.

Change-Id: I626fb01ff61ff507520d528122358ef687d297b7

n0ano/ganttclient