Fix regex in RateTestHandler
The regex parsing monitoring.json from hlt2/spruce_rate_and_size perodic tests need to be fixed due to lhcb/Moore!1730 (merged).
Edited by Shunan Zhang
The regex parsing monitoring.json from hlt2/spruce_rate_and_size perodic tests need to be fixed due to lhcb/Moore!1730 (merged).