Fix extending non-dict types from doc fragments

lib/ansible/utils/module_docs.py

@@ -23,6 +23,8 @@ import ast
 import yaml
 import traceback
 
+from collections import MutableMapping, MutableSet, MutableSequence
+
 from ansible import utils
 
 # modules that are ok that they do not have documentation strings
@@ -86,7 +88,14 @@ def get_docstring(filename, verbose=False):
                             if not doc.has_key(key):
                                 doc[key] = value
                             else:
-                                doc[key].update(value)
+                                if isinstance(doc[key], MutableMapping):
+                                    doc[key].update(value)
+                                elif isinstance(doc[key], MutableSet):
+                                    doc[key].add(value)
+                                elif isinstance(doc[key], MutableSequence):
+                                    doc[key] = sorted(frozenset(doc[key] + value))
+                                else:
+                                    raise Exception("Attempt to extend a documentation fragement of unknown type")
 
                 if 'EXAMPLES' in (t.id for t in child.targets):
                     plainexamples = child.value.s[1:]  # Skip first empty line