Certain LogMiner-specific tests are not being skipped while using Xstreams

As identified by jpechanec, the following commit already applied during 1.6 release needs to also exist on 1.7 and 1.8.

See https://github.com/debezium/debezium/commit/0bb5a8d0d867a3e56a9ab0422340fc9874b6fc18