Updates a WMStatsReader call from diagnoseActiveRuns script
separate tier0 request db and temporary db

change tier0 mod config
fix unittest
Merge pull request #4093 from lucacopa/active_runs_script_fix

Updates a WMStatsReader call from diagnoseActiveRuns script
Merge pull request #4095 from ticoann/t0_wmstats

separate tier0 request db and temporary db