Shuffle RESTful URL's around.

This patch moves the RESTful URL's around to more appropriate
locations for release.

The /stasis URL's are moved to /ari, since Asterisk REST Interface was
a more appropriate name than Stasis-HTTP. (Most of the code still has
stasis_http references, but they will be cleaned up after there are no
more outstanding branches that would have merge conflicts with such a
change).

A larger change was moving the ARI events WebSocket off of the shared
/ws URL to its permanent home on /ari/events. The Swagger code
generator was extended to handle "upgrade: websocket" and
"websocketProtocol:" attributes on an operation.

The WebSocket module was modified to better handle WebSocket servers
that have a single registered protocol handler. If a client
connections does not specify the Sec-WebSocket-Protocol header, and
the server has a single protocol handler registered, the WebSocket
server will go ahead and accept the client for that subprotocol.

(closes issue ASTERISK-21857)
Review: https://reviewboard.asterisk.org/r/2621/



git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@393528 65c4cc65-6c06-0410-ace0-fbb531ad65f3

rest-api-templates/rest_handler.mustache

@@ -1,4 +1,4 @@
-{{! -*- C -*-
+{{!
  * Asterisk -- An open source telephony toolkit.
  *
  * Copyright (C) 2013, Digium, Inc.
@@ -30,7 +30,9 @@ static struct stasis_rest_handlers {{full_name}} = {
 {{/is_wildcard}}
 	.callbacks = {
 {{#operations}}
+{{#is_req}}
 		[{{c_http_method}}] = stasis_http_{{c_nickname}}_cb,
+{{/is_req}}
 {{/operations}}
 	},
 	.num_children = {{num_children}},