added datasource cms-daq-dashboard, added deadtime
The prometheus-cms-daq-dashboard http://cms-daq-dashboard.cms:9090 is added, it allowed adding the TCDS deadtimes and the L1A post-dead time rates to various panels.
The left panels in the overview dashboard are rearranged to look better and occupy less space.
The Total L1A rate, Deadtime, HardReset and Resynch are added to the subsystem_monitoring dashboard, subsystems status panel .