ARI: bridges/{bridgeID}/addChannel: add roles parameter

Roles are now cleared with each entry into a bridge with addChannel.
If the roles parameter is present, the role specified will be applied
to all channels being added with the addChannel command.

(closes issue ASTERISK-21973)
Reported by: Matt Jordan
https://reviewboard.asterisk.org/r/2691/


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@396182 65c4cc65-6c06-0410-ace0-fbb531ad65f3

res/ari/resource_bridges.h

@@ -103,6 +103,8 @@ struct ast_add_channel_to_bridge_args {
 	size_t channel_count;
 	/*! \brief Parsing context for channel. */
 	char *channel_parse;
+	/*! \brief Channel's role in the bridge */
+	const char *role;
 };
 /*!
  * \brief Add a channel to a bridge.