[4.3.x] Fix #783 - Gracefully handle OSError for status page remote q…

…uery (#788)

(cherry picked from commit 572d903)

irrd/server/http/status_generator.py

@@ -1,5 +1,4 @@
 import logging
-import socket
 import textwrap
 from typing import Optional
 
@@ -177,7 +176,7 @@ def _generate_remote_status_info(self, nrtm_host: Optional[str], nrtm_port: int,
                     Remote status query unsupported or query failed
                     """
                 )
-            except (socket.timeout, ConnectionError):
+            except OSError:
                 return textwrap.dedent(
                     f"""
                     NRTM host: {nrtm_host} port {nrtm_port}