Ep-engine manifest for 2.0.1 points at 2.0.1 branch

I reverted the commits that caused the regressions in performance.

Change-Id: I8ac60f62c12f19cf64889a7105800508a28de1f9
Reviewed-on: http://review.couchbase.org/24906
Tested-by: Philip Labee <philip@couchbase.com>
Reviewed-by: Philip Labee <philip@couchbase.com>