MFC r276071:

Fix multiple ntp vulnerabilities.

Reviewed by:	roberto (earlier revision), philip
Security:	CVE-2014-9293, CVE-2014-9294
Security:	CVE-2014-9295, CVE-2014-9296
Security:	FreeBSD-SA-14:31.ntp
Strip trailing / characters from paths in "not present" index entries.

Errata:		FreeBSD-EN-14:13.freebsd-update
Approved by:	so@
MFC: r272491

  Reduce diffs against i386.