Added config file to setup unit test envars.
Added config file to setup unit test envars.

Added a configuration file that sets the proper environment variables required
to run the unit tests. Currently this includes the coordinator's location and
the number of servers in the cluster.

ellitron/ramcloud-gremlin,jdellithorpe/torc-gremlin,jdellithorpe/torc-gremlin,ellitron/ramcloud-gremlin