[CX] Tests failing because of range stats API output change

The output of the range stats API has changed, which is causing the prometheus stats to fail.

 

Sample:

expected < {"data":[{"metric":

{"nodes":["[0-9.:]+"],"instance":"cbas","name":"cbas_thread_count"}

,"values":[[[0-9",]]+]}],"errors":[]}

actual > {"data":[{"metric":

{"nodes":["172.18.0.3:9000"],"instance":"cbas","name":"cbas_thread_count"}

,"values":[[1616721104,"69"],[1616721114,"86"],[1616721124,"90"],[1616721134,"94"],[1616721144,"98"]]}],"errors":[],"startTimestamp":1616721084,"endTimestamp":1616721144}