MB-100: create vperf config with constant and disabled compaction

Change-Id: I1116631d68cfc5bf1052a89feb6b823f8708d221
Reviewed-on: http://review.couchbase.org/26266
Reviewed-by: Pavel Paulau <pavel.paulau@gmail.com>
Tested-by: Pavel Paulau <pavel.paulau@gmail.com>