Fix TypeError when using old simplejson lib.

On some very old simplejson does not support the 'encoding' and give
following exception:

   TypeError: __init__() got an unexpected keyword argument 'encoding'

This fix runs json.dump with no encoding key (such as before #a023cb) on
TypeError exception only.

lib/ansible/module_utils/basic.py

@@ -884,6 +884,9 @@ class AnsibleModule(object):
         for encoding in ("utf-8", "latin-1", "unicode_escape"):
             try:
                 return json.dumps(data, encoding=encoding)
+            # Old systems using simplejson module does not support encoding keyword.
+            except TypeError, e:
+                return json.dumps(data)
             except UnicodeDecodeError, e:
                 continue
         self.fail_json(msg='Invalid unicode encoding encountered')