Adding system test for HappyBase.
Adding system test for HappyBase.

For now, these are run against a local HBase/Thrift server.
The set-up will be re-purposed and then they will be run
against Cloud Bigtable. It's important (for consistency)
that they work first against HBase.

joerideturck/gcloud-python-bigtable,dhermes/gcloud-python-bigtable,joerideturck/gcloud-python-bigtable,dhermes/gcloud-python-bigtable