Werk #15033: check_mk_agent.linux: increase refresh interval for chrony section

Prior to this werk, the chrony cached section had the same value for both age validity and the refresh interval. This led to an occasional CRIT status on the associating service as this was influenced by the timing of the refresh mechanism, the cache file writeout duration as well as the section processing duration on Checkmk's side. This werk, therefore, increases the age validity of the cached section.

To take benefit of the described change, the user is required to redownload and reinstall the agent package.

To the list of all Werks