vncauthproxy will return error status if the instance is not running.
Cyclades check that the VM in marked as started in DB before allowing a
console action. However, the VM may be stopped without Cyclades knowing
it (unsynced state). This commit fixes this issue by checking the VM is
actually running, by looking the 'oper_state' field in the result of the
query, that is already performed to get the instance host and port. In
case the VM is stopped, state is reconciled by issuing a mocked
'OP_INSTANCE_SHUTDOWN' Ganeti job, that will take care of state and
quotas.

Also, remove use of 'TEST' setting that was used for unittests. Instead,
properly mock Ganeti and vncauthproxy responses.