ntp: import ntp-4.2.8p16

Security: NtpBUg3767, NtpBug3808, NtpBug3807 (CVE-2023-26555)
MFC after: immediately

MFV ntp 4.2.8p2 (r281348)

Reviewed by: delphij (suggested MFC)
Approved by: roberto
Security: CVE-2015-1798, CVE-2015-1799
Security: VuXML ebd84c96-dd7e-11e4-854e-3c970e169bc2
MFC aft

MFV ntp 4.2.8p2 (r281348)

Reviewed by: delphij (suggested MFC)
Approved by: roberto
Security: CVE-2015-1798, CVE-2015-1799
Security: VuXML ebd84c96-dd7e-11e4-854e-3c970e169bc2
MFC after: 1 month

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MFV ntp 4.2.8p1 (r258945, r275970, r276091, r276092, r276093, r278284)

Thanks to roberto for providing pointers to wedge this into HEAD.

Approved by: roberto