return err for RemoveHost if hostid does not exist
Merge pull request #1285 from control-center/feature/CC-443

fixes CC-443: return err for RemoveHost if hostid does not exist
log resetting cached client when higher verbosity is requested
Merge pull request #1286 from control-center/feature/CC-445

fixes CC-445: log resetting cached client when higher verbosity is requested
serviced metric push works
Merge pull request #1282 from control-center/feature/CC-409

serviced metric push works
keep a map of agent mux connection info and added /mux/connections REST method
added serviced service mux connections