{
       "Concurrency" : 64,
       "Clients" : 5,
       "ScanSpecs" : [
          {
             "Limit" : 1,
             "Low" : [
                "000015"
             ],
             "Repeat" : 149999999,
             "Type" : "Range",
             "Bucket" : "bucket-1",
             "High" : [
                "000028"
             ],
             "Id" : 1,
             "Inclusion" : 3,
             "Index" : "myindex",
             "NInterval" : 100,
             "RandomLen" : 12
           }
       ]
}

{
       "Concurrency" : 64,
       "Clients" : 5,
       "ScanSpecs" : [
          {
             "Limit" : 1,
             "Low" : [
                "000015"
             ],
             "Repeat" : 149999999,
             "Type" : "Range",
             "Bucket" : "bucket-1",
             "High" : [
                "000028"
             ],
             "Id" : 1,
             "Inclusion" : 3,
             "Index" : "myindex",
             "NInterval" : 100,
             "TestSpec" : { "RandomKeyLen": 12}
           }
       ]
}

Change RandomLen to RandomKeyLen in cbindexperf
Change RandomLen to RandomKeyLen in cbindexperf

Change-Id: I628e6ddb083d8ea7bcbb12c8a6f6795c9154404e
Reviewed-on: http://review.couchbase.org/c/perfrunner/+/141442
Tested-by: Build Bot <80754af91bfb6d1073585b046fe0a474ce868509@couchbase.com>
Reviewed-by: vikas chaudhary <c251871a64d7d31888eace0406cb3d4c419d5f73@couchbase.com>
