Fixup HawqIntegration to use new Hawq 1.1 server

The hawq metadata_for_dataset test now creates the table it looks for metadata on, rather than
expecting it to be created sometime in the past.
- We also discovered that you cannot select things like "reltuples from pg_catalog.pg_class" (i.e. row_count)
if you're not connected to the database where the tables you care about reside.