[nagios-plugins] check_ntp_time: adding offset option (#1184)

Just turning attached patch of github issue #907 into a push request.
You can merge this Pull Request by running:

  git pull https://github.com/waja/nagios-plugins github907

Or you can view, comment on it, or merge it online at:

  https://github.com/nagios-plugins/nagios-plugins/pull/1184

-- Commit Summary --

  * check_ntp_time: adding offset option

-- File Changes --

    M THANKS.in (1)
    M plugins/check_ntp_time.c (13)

-- Patch Links --

https://github.com/nagios-plugins/nagios-plugins/pull/1184.patch
https://github.com/nagios-plugins/nagios-plugins/pull/1184.diff

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