Refactor Open vSwitch Schema Integration Tests

- Add a Junit suite that runs the test in correct order
- Make changes to the pom to ensure only the suite is run rather than
  the individual test cases
- Fix failing IT's for the IPFIX table using Junit Assumptions
- Add test case to check correct exception is raised when a table is not
  supported in the current schema

Change-Id: I074f047e964610c7397af040946dde1b562754c0
Signed-off-by: Dave Tucker <djt@redhat.com>