CBQE-0: bump up threads/process

2->8

Change-Id: Ie4b142b5f3c1c8867d4cb768b16f4f05fe3779bd
Reviewed-on: http://review.couchbase.org/30536
Reviewed-by: Tommie McAfee <tommie@couchbase.com>
Tested-by: Tommie McAfee <tommie@couchbase.com>