examples: add example ntpd service

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
diff --git a/examples/var_service/ntpd/p_log b/examples/var_service/ntpd/p_log
new file mode 100755
index 0000000..a2521be
--- /dev/null
+++ b/examples/var_service/ntpd/p_log
@@ -0,0 +1,4 @@
+#!/bin/sh
+
+cd log/logdir || exit 1
+cat @* current | $PAGER