Checkmk Werk 13466: Increase cache validity for NTP service

ID: 13466 Title: Increase cache validity for NTP service Component: Checks & agents Level: 1 Class: Bug fix Version: 2.1.0i1 The data for the NTP service "NTP Time" and "NTP Peer" had a cache validity intervall of 30 seconds, in order to create a new data set every time the agent was triggered. Unfortunately this meant that the data was expired, before it ever reached the monitoring server. This hack increases the validitiy of the data set to 120 seconds, while still recreating it every time the agent is called.