LdapClient: init cache in __init__ method and reset it during initialization

Fix cache sharing problem when multiple clients are used on same soft

mylib/ldap.py

@@ -346,13 +346,14 @@ class LdapClient:
     _conn = None
 
     # Cache objects
-    _cached_objects = dict()
+    _cached_objects = None
 
     def __init__(self, options=None, options_prefix=None, config=None, config_section=None, initialize=False):
         self._options = options if options else {}
         self._options_prefix = options_prefix if options_prefix else 'ldap_'
         self._config = config if config else None
         self._config_section = config_section if config_section else 'ldap'
+        self._cached_objects = {}
         if initialize:
             self.initialize()
 
@@ -404,6 +405,8 @@ class LdapClient:
             uri, dn=binddn, pwd=self._get_option('bindpwd'),
             raiseOnError=True
         )
+        # Reset cache
+        self._cached_objects = {}
         return self._conn.connect()
 
     def decode(self, value):