Modify sip_setoption to not complain about unknown options.

This now behaves just like the other setoption callbacks. For the curious the
offending option for the reporter was AST_OPTION_CHANNEL_WRITE which was getting
passed due to a fix for chan_local in 286189.

(closes issue #17985)
Reported by: globalnetinc


git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/1.8@293305 65c4cc65-6c06-0410-ace0-fbb531ad65f3

channels/chan_sip.c

@@ -4031,7 +4031,6 @@ static int sip_setoption(struct ast_channel *chan, int option, void *data, int d
 		res = 0;
 		break;
 	default:
-		ast_log(LOG_NOTICE, "Unknown option: %d\n", option);
 		break;
 	}