[SA-14:31] Fix multiple vulnerabilities in NTP suite.
[EN-14:13] Fix directory deletion issue in freebsd-update.

Approved by:	so


git-svn-id: svn+ssh://svn.freebsd.org/base/releng/8.4@276154 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f