default station logs severity (#1301)

* changed from error to warn

* check if its an already exist log

---------

Co-authored-by: daniel-davidd <daniel@ip-192-168-1-103.eu-central-1.compute.internal>

server/memphis_handlers_producers.go

@@ -82,7 +82,11 @@ func (s *Server) createProducerDirectCommon(c *client, pName, pType, pConnection
 		var created bool
 		station, created, err = CreateDefaultStation(user.TenantName, s, pStationName, user.ID, user.Username, "", 0)
 		if err != nil {
-			serv.Errorf("[tenant: %v][user: %v]createProducerDirectCommon at CreateDefaultStation: creating default station error - producer %v at station %v: %v", user.TenantName, user.Username, pName, pStationName.external, err.Error())
+			if strings.Contains(err.Error(), "already exists") {
+				serv.Warnf("[tenant: %v][user: %v]createProducerDirectCommon at CreateDefaultStation: creating default station error - producer %v at station %v: %v", user.TenantName, user.Username, pName, pStationName.external, err.Error())
+			} else {
+				serv.Errorf("[tenant: %v][user: %v]createProducerDirectCommon at CreateDefaultStation: creating default station error - producer %v at station %v: %v", user.TenantName, user.Username, pName, pStationName.external, err.Error())
+			}
 			return false, false, err, models.Station{}
 		}
 		if created {