ARI: Support channel variables in originate

This adds back in support for specifying channel variables during an
originate without compromising the ability to specify query parameters
in the JSON body. This was accomplished by generating the body-parsing
code in a separate function instead of being integrated with the URI
query parameter parsing code such that it could be called by paths with
body parameters. This is transparent to the user of the API and
prevents manual duplication of code or data structures.

(closes issue ASTERISK-23051)
Review: https://reviewboard.asterisk.org/r/3122/
Reported by: Matt Jordan
........

Merged revisions 406003 from http://svn.asterisk.org/svn/asterisk/branches/12


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@406006 65c4cc65-6c06-0410-ace0-fbb531ad65f3

rest-api-templates/res_ari_resource.c.mustache

@@ -66,6 +66,7 @@ ASTERISK_FILE_VERSION(__FILE__, "$Revision$")
 {{#apis}}
 {{#operations}}
 {{#is_req}}
+{{> body_parsing}}
 /*!
  * \brief Parameter parsing callback for {{path}}.
  * \param get_params GET parameters in the HTTP request.
@@ -83,11 +84,6 @@ static void ast_ari_{{c_name}}_{{c_nickname}}_cb(
 	struct ast_variable *i;
 {{/has_parameters}}
 	RAII_VAR(struct ast_json *, body, NULL, ast_json_unref);
-{{^body_parameter}}
-{{#has_query_parameters}}
-	struct ast_json *field;
-{{/has_query_parameters}}
-{{/body_parameter}}
 #if defined(AST_DEVMODE)
 	int is_valid;
 	int code;