Fixed OVSDB plugin Integration Test issue on Jenkins server

1. Removed SureFire plugin and made this FailSafe only IT
2. Moved IT files carrying individual test-case grouped under more logically placed IT classes
3. Changed the port name constants from eth0, eth1 to test0, test1 (somehow this affects Jenkins. Need to work on that more to understand the rootcause).
4. Moved all the Tests under TestSuite with TearDown

Change-Id: I8cc8225332910bcf0c56babb10010d55c9e8df99
Signed-off-by: Madhu Venugopal <mavenugo@gmail.com>