CBQE-0: fix test_warm_up_progress

values for ep_warmup_state have been changed

Change-Id: Icfa03ac55d43d6c97ef992dbb563bf6526d7d9bf
Reviewed-on: http://review.couchbase.org/41607
Reviewed-by: Meenakshi Goel <meenakshi.goel@globallogic.com>
Tested-by: buildbot <build@couchbase.com>