restconf_config module (#51971)

* Add restconf_config module

* Try to do the right thing when given partial paths

* Add PATCH

* Delete should not require content

* Non-JSON exceptions need raising, too

* Let ConnectionError objects pass through exec_jsonrpc

lib/ansible/module_utils/network/common/utils.py

@@ -264,7 +264,9 @@ def dict_diff(base, comparable):
         if isinstance(value, dict):
             item = comparable.get(key)
             if item is not None:
-                updates[key] = dict_diff(value, comparable[key])
+                sub_diff = dict_diff(value, comparable[key])
+                if sub_diff:
+                    updates[key] = sub_diff
         else:
             comparable_value = comparable.get(key)
             if comparable_value is not None: