ARI: Add subscription support

This patch adds an /applications API to ARI, allowing explicit management of
Stasis applications.

 * GET /applications - list current applications
 * GET /applications/{applicationName} - get details of a specific application
 * POST /applications/{applicationName}/subscription - explicitly subscribe to
   a channel, bridge or endpoint
 * DELETE /applications/{applicationName}/subscription - explicitly unsubscribe
   from a channel, bridge or endpoint

Subscriptions work by a reference counting mechanism: if you subscript to an
event source X number of times, you must unsubscribe X number of times to stop
receiveing events for that event source.

Review: https://reviewboard.asterisk.org/r/2862

(issue ASTERISK-22451)
Reported by: Matt Jordan
........

Merged revisions 400522 from http://svn.asterisk.org/svn/asterisk/branches/12


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@400523 65c4cc65-6c06-0410-ace0-fbb531ad65f3

include/asterisk/_private.h

@@ -142,4 +142,12 @@ int ast_parking_stasis_init(void);
 
 /*! \brief initialize the sounds index */
 int ast_sounds_index_init(void);
+
+/*!
+ * \brief Endpoint support initialization.
+ * \return 0 on success.
+ * \return Non-zero on error.
+ */
+int ast_endpoint_init(void);
+
 #endif /* _ASTERISK__PRIVATE_H */