Re-enable some tests in test_describe_formatted

A few tests which dealt with running queries via hs2 and impala were marked as xfail as
hiveserver2 would occasionally not come up. Given that we now have a script that checks
whether hiveserver2 is up before continuining the build, it should be safe to remove the
xfail.

Change-Id: I2b5063e7259c01fc0ef8ffda86d85514c9cf959c
Reviewed-on: http://gerrit.ent.cloudera.com:8080/2082
Reviewed-by: Lenni Kuff <lskuff@cloudera.com>
Tested-by: jenkins