Fixed the Basic Bridge create Integration Test by performing mutate on OpenVSwitch Table.

Also added
- Fixed a multiValue bug in Mutate
- the cleanup @After method to delete the created br-test
- few global variables that can be reused across test and cleanup (such as BridgeUuid)
- Fixed a Compiler warning in Insert

Change-Id: I091d7fa7b59d36718d9cca42cc8669a73461a764
Signed-off-by: Madhu Venugopal <mavenugo@gmail.com>