Fix bsnmpd remote denial of service vulnerability. [SA-14:01]

Fix ntpd distributed reflection Denial of Service vulnerability.
[SA-14:02]

Fix BIND remote denial of service vulnerability. [SA-14:04]

Disable hardware RNGs by default. [EN-14:01]

Fix incorrect coalescing of stack entry with mmap. [EN-14:02]

Approved by:	so


git-svn-id: svn+ssh://svn.freebsd.org/base/releng/9.2@260647 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f