ash: fix signal and "set -e" interaction

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
diff --git a/shell/ash_test/ash-signals/signal8.right b/shell/ash_test/ash-signals/signal8.right
new file mode 100644
index 0000000..39572f3
--- /dev/null
+++ b/shell/ash_test/ash-signals/signal8.right
@@ -0,0 +1,3 @@
+Removing traps
+End of exit_func
+Done: 0