[cbindexperf] Support for integer values in RandomScanRange

12:43:23 2022-03-14T00:13:23 [INFO] To be applied: ./opt/couchbase/bin/cbindexperf -cluster 172.23.110.72:8091 -auth="Administrator:password" -configfile tests/gsi/scan_config/config_scan_1s_1c_1idx_partition.json -resultfile result.json -statsfile /root/statsfile -gcpercent 200 -cpuprofile cpuprofile.prof -memprofile memprofile.prof 

12:43:23 Log Level = error

12:43:23 Setting gc percentage to 200

12:43:29 GsiClients warmed up ...

12:43:29 panic: interface conversion: interface {} is float64, not string

12:43:29 

12:43:29 goroutine 452 [running]:

12:43:29 main.RandomScanRange.GetLow(...)

12:43:29 	goproj/src/github.com/couchbase/indexing/secondary/cmd/cbindexperf/test_executor.go:42

12:43:29 main.RunJob(0xc0009ae580, 0xc0019c4320, 0xc0016dc060, 0xfa6fa0, 0xc0019b82c8)

12:43:29 	goproj/src/github.com/couchbase/indexing/secondary/cmd/cbindexperf/executor.go:99 +0x4da

12:43:29 main.Worker(0xc0016dc000, 0xc0009ae580, 0xc0016dc060, 0xc000179f40)

12:43:29 	goproj/src/github.com/couchbase/indexing/secondary/cmd/cbindexperf/executor.go:135 +0x90

12:43:29 created by main.RunCommands

12:43:29 	goproj/src/github.com/couchbase/indexing/secondary/cmd/cbindexperf/executor.go:218 +0x530

12:43:29 

12:43:29 Fatal error: local() encountered an error (return code 2) while executing './opt/couchbase/bin/cbindexperf -cluster 172.23.110.72:8091 -auth="Administrator:password" -configfile tests/gsi/scan_config/config_scan_1s_1c_1idx_partition.json -resultfile result.json -statsfile /root/statsfile -gcpercent 200 -cpuprofile cpuprofile.prof -memprofile memprofile.prof ' 

{

    "Clients": 5,

    "Concurrency": 128,

    "ScanSpecs": [

        {

            "Bucket": "bucket-1",

            "Collection": "collection-1",

            "High": [

                400

            ],

            "Id": 1,

            "Inclusion": 3,

            "Index": "index1-1",

            "Limit": 1,

            "Low": [

                0

            ],

            "NInterval": 100,

            "Repeat": 19999,

            "Scope": "scope-1",

            "Type": "Range",

            "TestSpec": {

                "RandomKeyLen": 3

            }

        }

    ]

}