Changing the ovsdb.of.version to 1.3 by default in config.ini

This gerrit must be merged first prior to
https://git.opendaylight.org/gerrit/#/c/7842
in order to keep the ovsdb project dependency assumptions intact.

Change-Id: I47480b5255b4a595aabcac68900726e45319b178
Signed-off-by: Madhu Venugopal <mavenugo@gmail.com>