api.wiki.mustache: Update wiki template to support body parameters

This patch updates the api.wiki.mustache template and the swagger_model python
script to understand if an operation has a body parameter. If an operation
does have a body parameter, it will now be displayed in the corresponding
wiki entry.


git-svn-id: http://svn.asterisk.org/svn/asterisk/branches/12@407389 f38db490-d61c-443f-a65b-d21fe96a405b