Switch from using OvsdbCreateCommand to using OpenVSwitchUpdateCommand

Have the initial registration of the ovsdb-node come from getting
the OpenVswitch table data come to use from the monitor command in the
initial db dump.

This passes all SB-IT tests:

Tests run: 21, Failures: 0, Errors: 0, Skipped: 0

Change-Id: If098081bb89292f0bac320659b41fa05994e195e
Signed-off-by: Ed Warnicke <hagbard@gmail.com>