rest-api-templates: Wikify error code response reasons

Error response code descriptions may contain wiki markup that need to be
escaped. Without this patch, Confluence will reject the document being sent
and the responsible script will raise an exception.

Change-Id: I21fcb66fee7f6332381f2b99b1b0195dff215ee5

rest-api-templates/api.wiki.mustache

@@ -67,7 +67,7 @@ h3. Header parameters
 
 h3. Error Responses
 {{#error_responses}}
-* {{code}} - {{{reason}}}
+* {{code}} - {{{wiki_reason}}}
 {{/error_responses}}
 {{/has_error_responses}}
 {{/operations}}

rest-api-templates/asterisk_processor.py

@@ -199,6 +199,8 @@ class AsteriskProcessor(SwaggerPostProcessor):
             raise SwaggerError("Summary should end with .", context)
         operation.wiki_summary = wikify(operation.summary or "")
         operation.wiki_notes = wikify(operation.notes or "")
+        for error_response in operation.error_responses:
+            error_response.wiki_reason = wikify(error_response.reason or "")
         operation.parse_body = (operation.body_parameter or operation.has_query_parameters) and True
 
     def process_parameter(self, parameter, context):