Added for: 1m into NginxServiceDown

Since telegraf is doing often HTTP check on status page hosted
by Nginx on a dedicated port, we should take into account that one simple
non 200 HTTP resp code or not recieved within the time window is not
an indication that the Nginx service is down. Lets use for: 1m here
to prevent false positives.

Change-Id: I569e98b902d6a43fc653523b35b2c94de329527f
Closes-Bug: PROD-27342
1 file changed