make escape sequence to exit tty optional

src/lxc/console.c

@@ -641,6 +641,7 @@ static int lxc_console_cb_tty_stdin(int fd, uint32_t events, void *cbdata,
 		return 1;
 	}
 
+	if (ts->escape != -1) {
 		/* we want to exit the console with Ctrl+a q */
 		if (c == ts->escape && !ts->saw_escape) {
 			ts->saw_escape = 1;
@@ -651,6 +652,8 @@ static int lxc_console_cb_tty_stdin(int fd, uint32_t events, void *cbdata,
 			return 1;
 
 		ts->saw_escape = 0;
+	}
+
 	if (write(ts->masterfd, &c, 1) < 0) {
 		SYSERROR("failed to write");
 		return 1;