Increase default_pool_max_requests in run-all-tests.

Temporarily increase the cap on max requested queries while running tests to unblock
builds. Currently, the exhaustive runs always fails, and there are some intermittent
failures in the core runs.

Change-Id: I26b9ce343d72bab7687e49f7dbd7bf3bf655a294
Reviewed-on: http://gerrit.ent.cloudera.com:8080/2323
Reviewed-by: Ishaan Joshi <ishaan@cloudera.com>
Tested-by: jenkins