Remove confusing errors from bgpq3/bgpq4 output

pierky/arouteserver/irrdb.py

@@ -169,11 +169,23 @@ def _run_cmd(self, cmd):
             raise ValueError(err_msg)
 
         if err is not None and err.strip():
-            logging.warning("{} succeeded but an error was "
-                            "printed when executing '{}': {}".format(
-                                self.bgpq,
-                                " ".join(cmd), err.strip()
-                            ))
+            # If an error was returned, remove any line containing
+            # "Invalid AS number:". This is printed to stderr when
+            # private ASNs are found in the output, but it's just
+            # confusing and not useful for the user.
+            err_lines = err.strip().split("\n")
+            err = "\n".join([
+                line
+                for line in err_lines
+                if "Invalid AS number:" not in line
+            ])
+
+            if err:
+                logging.warning("{} succeeded but an error was "
+                                "printed when executing '{}': {}".format(
+                                    self.bgpq,
+                                    " ".join(cmd), err.strip()
+                                ))
 
         return out