CBQE:0 Downsize xdcr upgrade test suite, consult PM reg same

Removed 2.0.0 tests, capi for  >-2.2.0 tests, removed separate source, dest upgrade tests(we have a bi-xdcr bucket that can reveal backward/forward incompatibility- also added load to C2 bi-xdcr bucket so we can check bi-xdcr after upgrade) and some tests that became subtests over time. Conf has reviewed by Anil.

Change-Id: Ic902ae517596b7f8c46cc9874e819091a004ac4d
Reviewed-on: http://review.couchbase.org/40845
Reviewed-by: Sangharsh Agarwal <sangharsh.agarwal@globallogic.com>
Tested-by: Aruna Piravi <aruna@couchbase.com>