fix mem_quota in tools_expimp_60M_json_sample.test
fix mem_quota in tools_expimp_60M_json_sample.test

Change-Id: I3339213dcbe5586c552e112f5934338005dad3b1
Reviewed-on: http://review.couchbase.org/69723
Reviewed-by: Andrei Baranouski <f6b50d8f3f8d6abadc89468769320bb7ef9099f0@gmail.com>
Tested-by: buildbot <80754af91bfb6d1073585b046fe0a474ce868509@couchbase.com>

couchbase/perfrunner,pavel-paulau/perfrunner,pavel-paulau/perfrunner,couchbase/perfrunner,pavel-paulau/perfrunner,pavel-paulau/perfrunner,pavel-paulau/perfrunner,couchbase/perfrunner,couchbase/perfrunner,couchbase/perfrunner,couchbase/perfrunner