Fix RabbitMQ export verifier in genqa.

Also read rows in the export table in the other schema. genqa does catalog
updates throughout the run, need to catch all cases.
Disable DR version 2 until there is UI for enabling it piecemeal
Merge pull request #1537 from VoltDB/genqa-rabbit

Fix RabbitMQ export verifier in genqa.

r=akhanzode
Merge branch 'master' of github.com:VoltDB/voltdb into ENG-6590-inline-limit-for-aggregate