Provider loop discovery almost finished

Provider lookup will lookup on startup, do the healthcheck until the
stream starts and also restart on stream closure or provider stall

telemetry/provider.go

@@ -1,9 +1,12 @@
 // Package telemetry is our interface with our data sources
 package telemetry
 
+import "time"
+
 type TelemetryProvider interface {
 	StopStream()
 	Stream() (<-chan TelemetryData, error)
 	Subscribe(map[int16]FieldID)
-	Stalled() bool // Return true if no fresh data is coming
+	IsAlive(time.Duration) bool
+	Close()
 }