Prevent CLI prompt from distorting output of lines shorter than the prompt.

Uses the VT100 method of clearing the line from the cursor position to the
end of the line:  Esc-0K

(closes issue #17160)
 Reported by: coolmig
 Patches: 
       20100531__issue17160.diff.txt uploaded by tilghman (license 14)
 Tested by: coolmig


git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/1.4@266585 65c4cc65-6c06-0410-ace0-fbb531ad65f3

main/asterisk.c

@@ -1863,7 +1863,7 @@ static int ast_el_read_char(EditLine *el, char *cp)
 
 			/* Write over the CLI prompt */
 			if (!ast_opt_exec && !lastpos) {
-				if (write(STDOUT_FILENO, "\r", 1) < 0) {
+				if (write(STDOUT_FILENO, "\r", 5) < 0) {
 				}
 			}
 			if (write(STDOUT_FILENO, buf, res) < 0) {