CBQE-0: Modify perf_sanity_index_2M to increase query time to 20 mins
CBQE-0: Modify perf_sanity_index_2M to increase query time to 20 mins

Change-Id: I6e5a918447ecc1392b1e89b659bba11949bdb804
Reviewed-on: http://review.couchbase.org/61656
Reviewed-by: Ketaki Gangal <a5dce29d82b35a7c3450ec2c8589d08111573475@couchbase.com>
Tested-by: Ketaki Gangal <a5dce29d82b35a7c3450ec2c8589d08111573475@couchbase.com>

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