eventlet.monkey_patch() for spice and vnc proxy

The VNC proxy and spice apps did not run eventlet.monkey_patch(). These
services uses rpc to talk to nova-consoleauth, so eventlet is required.

Note that this is a stable/grizzly patch only. The issue does not
affect master (havana) anymore as it was resolved as a side effect of
switching everything in bin/ over to using entry points. The monkey
patching is done in nova/cmd/__init__.py now.

Change-Id: I61cb1212d283e41e6fda88a9521a9e54143af1fb
Merge "eventlet.monkey_patch() for spice and vnc proxy" into stable/grizzly