[SA-14:24] Fix denial of service attack against sshd(8).

[SA-14:24] Fix denial of service attack against sshd(8).
[SA-14:25] Fix kernel stack disclosure in setlogin(2) / getlogin(2).
[SA-14:26] Fix remote command execution in ftp(1).
[EN-14:12] Fix NFSv4 and ZFS cache consistency issue.

Approved by:	so (des)

git-svn-id: svn://svn.freebsd.org/base/releng/9.2@274113 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f