CBQE-1354: add test with 100 concurrent queries

Change-Id: I609f09054e95ec34d17a2734be8173fb7198992a
Reviewed-on: http://review.couchbase.org/27338
Tested-by: buildbot <build@couchbase.com>
Reviewed-by: Andrei Baranouski <andrei.baranouski@gmail.com>
MB-8505: tune xperf config

Change-Id: I0245213d9aa89c3cc41d33f15b851f6b0b0b7157
Reviewed-on: http://review.couchbase.org/27394
Reviewed-by: Pavel Paulau <pavel.paulau@gmail.com>
Tested-by: Pavel Paulau <pavel.paulau@gmail.com>
MB-100: revised litmus tests

Change-Id: Ifa7d8b3c60684e5e8fa76a25d87d21422cc4031d
Reviewed-on: http://review.couchbase.org/27396
Reviewed-by: Ronnie Sun <ronnie@couchbase.com>
Tested-by: Ronnie Sun <ronnie@couchbase.com>