Add option to skip karaf tests for southbound
Add option to skip karaf tests for southbound

The karaf test is enabled by default and can only be disabled by explicitly add -Dskip.karaf=true to the mvn build command.

Change-Id: I524d2494568dae61a5112191cb889e28dfb7a073
Signed-off-by: Sam Hague <0bd82f91a319b8977788d8264eb020ecd4ace960@redhat.com>

opendaylight/ovsdb,opendaylight/ovsdb,opendaylight/ovsdb