import: downgrade HTTP error code log message levels

Let's downgrade log levels a bit on HTTP error codes. After all we
gracefully handle many of them, and we do generated an extra message for
the ones which are fatal anyway, hence there's no point in emphasizing
the HTTP erro message levels as we currently do.

src/import/pull-job.c

@@ -187,7 +187,7 @@ void pull_job_curl_on_finished(CurlGlue *g, CURL *curl, CURLcode result) {
                                 }
                         }
 
-                        r = log_error_errno(
+                        r = log_notice_errno(
                                         status == 404 ? SYNTHETIC_ERRNO(ENOMEDIUM) : SYNTHETIC_ERRNO(EIO), /* Make the most common error recognizable */
                                         "HTTP request to %s failed with code %li.", j->url, status);
                         goto finish;