Added owner_callsign

This adds a new option in the aprsd.conf [DEFAULT] section
that denotes who is the callsign that officially owns this APRSD
instance.  This will be used for sending the instance info to the
registry.  It's useful when the callsign used by the instance is
something useful on the APRS network, which isn't necessarily the
same as the person that owns it.

tests/plugins/test_version.py

@@ -40,8 +40,9 @@ class TestVersionPlugin(test_plugin.TestPlugin):
             }
         }
 
-        expected = f'APRSD ver:{aprsd.__version__} uptime:00:00:00'
         CONF.callsign = fake.FAKE_TO_CALLSIGN
+        CONF.owner_callsign = None
+        expected = f'APRSD ver:{aprsd.__version__} uptime:00:00:00 owner:-'
         version = version_plugin.VersionPlugin()
         version.enabled = True
 
@@ -62,3 +63,22 @@ class TestVersionPlugin(test_plugin.TestPlugin):
 
         # Verify the mock was called exactly once
         mock_collector_instance.collect.assert_called_once()
+
+    @mock.patch('aprsd.stats.collector.Collector')
+    def test_version_shows_owner_callsign_when_set(self, mock_collector_class):
+        mock_collector_instance = mock_collector_class.return_value
+        mock_collector_instance.collect.return_value = {
+            'APRSDStats': {'uptime': '01:23:45'},
+        }
+
+        CONF.callsign = fake.FAKE_TO_CALLSIGN
+        CONF.owner_callsign = 'K0WN3R'
+        version = version_plugin.VersionPlugin()
+        version.enabled = True
+
+        packet = fake.fake_packet(message='version', msg_number=1)
+        actual = version.filter(packet)
+        self.assertEqual(
+            actual,
+            f'APRSD ver:{aprsd.__version__} uptime:01:23:45 owner:K0WN3R',
+        )