azure: update diagnostic from warning level to debug

This is normal behavior, don't warn.

Signed-off-by: Chris Patterson <cpatterson@microsoft.com>

cloudinit/sources/DataSourceAzure.py

@@ -1020,7 +1020,7 @@ def _wait_for_nic_detach(self, nl_sock):
             else:
                 report_diagnostic_event(
                     "The preprovisioned nic %s is detached" % ifname,
-                    logger_func=LOG.warning,
+                    logger_func=LOG.debug,
                 )
         except AssertionError as error:
             report_diagnostic_event(str(error), logger_func=LOG.error)