Werk #16250: Handle years in ntp output

This werk affects you, in case your last ntpq synchronization was indeed more than a year ago.

A potential check crash traceback looks like:

  File "/omd/sites/SITE/lib/python3/cmk/base/plugins/agent_based/ntp.py", line 67, in _ntp_fmt_time
    return int(raw)
ValueError: invalid literal for int() with base 10: '3y'

The year case is now handled in the parse function.

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