lib/httpserver: log the client address additionally to the requestURI in the SendPrometheusError()

This should allow detecting the client, which led to the error logged via SendPrometheusError() function,
e.g. this improves troubleshooting of the logged errors.

This is a follow-up for c9bb4ddeed

lib/httpserver/prometheus.go

@@ -3,15 +3,14 @@ package httpserver
 import (
 	"errors"
 	"net/http"
-
-	"github.com/VictoriaMetrics/VictoriaMetrics/lib/logger"
 )
 
 // SendPrometheusError sends err to w in Prometheus querying API response format.
 //
 // See https://prometheus.io/docs/prometheus/latest/querying/api/#format-overview for more details
 func SendPrometheusError(w http.ResponseWriter, r *http.Request, err error) {
-	logger.WarnfSkipframes(1, "error in %q: %s", GetRequestURI(r), err)
+	errStr := err.Error()
+	logHTTPError(r, errStr)
 
 	w.Header().Set("Content-Type", "application/json")
 	statusCode := http.StatusUnprocessableEntity