blueprint operational-status-ovs-plugin

blueprint operational-status-ovs-plugin

Implements operational status API for OVS plugin.   Uses existing
database model for operational status.  For network, status is always
up.  For a port, status is down unless there is an agent that
indicates that the port is active on its compute host.

Updated: use Salvatore's config hook to set default op-status for OVS
in OVS run_tests.py

Updated: fixed issue in _make_port_dict() found by Brad.

Change-Id: I0560cbde9dc69bd4211d9aaf12cef204df2f7664