Mongo tests start a a mongo cluster on hard coded ports

This fails when running multiple instances of the tests on the same machine (in CI for example)
https://github.com/apache/drill/blob/27364122ca0a82c6dd5552f292b2711bb2b28cf5/contrib/storage-mongo/src/test/java/org/apache/drill/exec/store/mongo/MongoTestConstants.java#L24