CBQE-0: 1. add code to use 'group' build parameter from downstream job
        2. added upgrade_version parameter used for upgrade jobs

Change-Id: I27ef5b02233cf89a8e9b8caf90dbe7a226bc0d80
Reviewed-on: http://review.couchbase.org/42108
Tested-by: buildbot <build@couchbase.com>
Reviewed-by: Andrei Baranouski <andrei.baranouski@gmail.com>
Reviewed-by: Sangharsh Agarwal <sangharsh.agarwal@globallogic.com>
Tested-by: Sangharsh Agarwal <sangharsh.agarwal@globallogic.com>