statd: reduce log warning to debug

This fixes the following log message on systems w/o firewall enabled
dumping operational data:

Dec  2 09:24:57 test-00-02-00 yanger[5352]: Failed to connect to firewalld D-Bus: org.freedesktop.DBus.Error.ServiceUnknown: The name org.fedoraproject.FirewallD1 was not provided by any .service files

[skip ci]

Signed-off-by: Joachim Wiberg <[email protected]>

Author: troglobit

src/statd/python/yanger/infix_firewall.py

@@ -19,7 +19,8 @@ def get_interface(interface="org.fedoraproject.FirewallD1"):
         return dbus.Interface(obj, dbus_interface=interface)
 
     except dbus.exceptions.DBusException as e:
-        common.LOG.warning("Failed to connect to firewalld D-Bus: %s", e)
+        # Firewall service may not be running, this is not an error
+        common.LOG.debug("Firewalld not available: %s", e)
         return None