batch, schema: use Dict instead of Any

Add new Dict parameter class and use it in the batch and command_defaults
plugins.

https://fedorahosted.org/freeipa/ticket/4739

Reviewed-By: David Kupka <dkupka@redhat.com>

ipaclient/remote_plugins/schema.py

@@ -41,8 +41,8 @@ _PARAMS = {
     'bool': parameters.Bool,
     'bytes': parameters.Bytes,
     'datetime': parameters.DateTime,
+    'dict': parameters.Dict,
     'int': parameters.Int,
-    'object': parameters.Any,
     'str': parameters.Str,
 }