Cleaned up Integration Test setup

1. Removed integration-test.properties from library and plugins
2. Removed unused json files from plugins.
3. Fixed all the places where some random default ipaddress / port is used
4. Forcing inclusion of ovsdbserver.ipaddress System Property when running integration Tests by an AssertFail.
5. Fixed a bug in OvsdbTestDeletePortIT

Change-Id: Icf5990fb11f66c90c0ec9c8cb30af8907ab121e6
Signed-off-by: Madhu Venugopal <mavenugo@gmail.com>
Merge "Cleaned up Integration Test setup" into topic/schema