host.import_vm: report when VM not found in cache

Author: ydirson

lib/host.py

@@ -219,6 +219,7 @@ def import_vm(self, uri, sr_uuid=None, use_cache=False):
                 if not vm.vdi_uuids() or vm.get_sr().uuid == sr_uuid:
                     logging.info(f"Reusing cached VM {vm.uuid} for {uri}")
                     return vm
+            logging.info("Not found vm in cache with key %r", cache_key)
 
         params = {}
         msg = "Import VM %s" % uri