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Following the docs online (Newton), the installation was successful.
However when the VM that has the controller (and ovn-nb) restarted, it
fails to bring up ovs & ovn. This is ubuntu deployment using
python-networking-ovn and locally built ovn. Is this a deployment problem?
Is it possible to recover from here without losing the neutron DB sync? I
have not configured any networks that I need to save.

NOTE: I did a reboot once before and the services came back fine at that
time. Not sure if there is a sequence to be followed while shutting down -
if so can I know what it would be?

Nov  2 15:19:42 controller neutron-server[2715]: 2016-11-02 15:19:42.003
3052 ERROR networking_ovn.ovsdb.impl_idl_ovn [-] OVS database connection to
OVN_Northbound failed with error: 'Could not retrieve schema from tcp:
192.168.56.102:6641: Connection refused'. Verify that the OVS and OVN
services are available and that the 'ovn_nb_connection' and
'ovn_sb_connection' configuration options are correct.
Nov  2 15:19:42 controller neutron-server[2715]: 2016-11-02 15:19:42.003
3052 ERROR networking_ovn.ovsdb.impl_idl_ovn Traceback (most recent call
last):
Nov  2 15:19:42 controller neutron-server[2715]: 2016-11-02 15:19:42.003
3052 ERROR networking_ovn.ovsdb.impl_idl_ovn   File
"/usr/lib/python2.7/dist-packages/networking_ovn/ovsdb/impl_idl_ovn.py",
line 84, in __init__
....
....
Nov  2 15:19:42 controller neutron-server[2715]: 2016-11-02 15:19:42.003
3052 ERROR networking_ovn.ovsdb.impl_idl_ovn     'err': os.strerror(err)})
Nov  2 15:19:42 controller neutron-server[2715]: 2016-11-02 15:19:42.003
3052 ERROR networking_ovn.ovsdb.impl_idl_ovn Exception: Could not retrieve
schema from tcp:192.168.56.102:6641: Connection refused
Nov  2 15:19:42 controller neutron-server[2715]: 2016-11-02 15:19:42.003
3052 ERROR networking_ovn.ovsdb.impl_idl_ovn
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