added maxsize param to lru_cache (for py3.6)

inventory_provider/routes/common.py

@@ -260,7 +260,7 @@ def load_xml_docs(config_params, key_pattern, num_threads=10):
         config_params, key_pattern, num_threads, doc_type=_DECODE_TYPE_XML)
 
 
-@functools.lru_cache
+@functools.lru_cache(maxsize=None)
 def load_snmp_indexes(hostname=None):
     result = dict()
     key_pattern = f'snmp-interfaces:{hostname}*' \