MB-41095: Update unit test so we don't fail if snapshot boundaries change
MB-41095: Update unit test so we don't fail if snapshot boundaries change

Unit test updated so it doesn't check every message coming from
the producer, we are scanning for the expected stream-end and
checking that is as expected.

Change-Id: I2cc12131faf1a691f157a1aeae132be5ec38429f
Reviewed-on: http://review.couchbase.org/c/kv_engine/+/135623
Reviewed-by: Dave Rigby <a09264da4832c7ff1d3bf1608a19f4b870f93750@couchbase.com>
Tested-by: Dave Rigby <a09264da4832c7ff1d3bf1608a19f4b870f93750@couchbase.com>

daverigby/kv_engine,daverigby/kv_engine,daverigby/kv_engine,daverigby/kv_engine