Security fix for CVE-2017-6464 CVE-2017-6462 CVE-2017-6463 CVE-2017-6458 CVE-2017-6451 CVE-2017-6460 CVE-2016-9042.

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This update improves the default configuration file to use the pool directive. It also replaces the ntpstat program with a shell script that uses the ntpq program instead of implementing the mode 6 protocol.