examples: add example ntpd service

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
diff --git a/examples/var_service/ntpd/w_log b/examples/var_service/ntpd/w_log
new file mode 100755
index 0000000..34b19b3
--- /dev/null
+++ b/examples/var_service/ntpd/w_log
@@ -0,0 +1,4 @@
+#!/bin/sh
+
+cd log/logdir || exit 1
+watch -n2 'w=`ttysize w`; h=`ttysize h`; tail -$((h-3)) current 2>&1 | cut -b0-$((w-2))'