Add BGPProperties validator as a JUnit test.

To use it, set BGP_PROPERTIES_PATH to your properties file,
remove @Ignore annotation in the test,
and run the test.

If the test fails, a surefire-report will be generated with information of the error.
Debugging may also help to finding where the error is.
Allow BGP properties validator application to get the path from the user.

The application can be used as a validator without need to recompile.
Merge pull request #702 from isartcanyameres/feature/bgp-properties-validator

Add BGPProperties validator as a JUnit test.