Enhance debugging to try to diagnose failing test on jenkins machine.

com.couchbase.lite.replicator.ReplicationTest > testPuller[cblite(AVD) - 4.2.2] [31mFAILED [0m
	junit.framework.AssertionFailedError
	at com.couchbase.lite.replicator.ReplicationTest.testPuller(ReplicationTest.java:530)