CBIDXT-117: Tool for load-generation.

Change-Id: I31094792660c9875757e9acc51aa6d1cbaf99c21
Reviewed-on: http://review.couchbase.org/39870
Reviewed-by: John Liang <johliang00@gmail.com>
Reviewed-by: Pratap Chakravarthy <prataprc@couchbase.com>
Tested-by: Pratap Chakravarthy <prataprc@couchbase.com>