Disable dns_lookup for NTP Telegraf input plugin

Sometimes output of 'ntpq -p' is dirty and can't be parsed by
Telegraf plugin. There will be run 'ntpq -np' after this change by
default.

Change-Id: I1fa8650e65bb3774d86a23ba04b6f9b5a3e0de87
diff --git a/ntp/files/telegraf.conf b/ntp/files/telegraf.conf
index 0f6df99..7858467 100644
--- a/ntp/files/telegraf.conf
+++ b/ntp/files/telegraf.conf
@@ -1,2 +1,2 @@
 [[inputs.ntpq]]
-  dns_lookup = {{ values.dns_lookup|default("true") }}
\ No newline at end of file
+  dns_lookup = {{ values.dns_lookup|default("false") }}
\ No newline at end of file