Added content for the chapter on OVSDB.

THis patch was based on Sujatha's work, but I just fixed some issues to
get it to build and to size images right.

Change-Id: If51633bcfd41e1b7b413bac2090588ce0e274e89
Signed-off-by: Sujatha Joseph <josephs@brocade.com>
Signed-off-by: Mathieu Lemay <mlemay@inocybe.com>
Signed-off-by: Colin Dixon <colin@colindixon.com>
Updated content for the chapter on OVSDB.

Change-Id: I5dc89313e37451aed8a5b01db3c84bce5f03abdd
Signed-off-by: Flavio Fernandes <ffernand@redhat.com>
Merge changes I5dc89313,If51633bc

* changes:
  Updated content for the chapter on OVSDB.
  Added content for the chapter on OVSDB.