o Fix SCTP ICMPv6 error message vulnerability. [SA-16:01.sctp]

o Fix SCTP ICMPv6 error message vulnerability. [SA-16:01.sctp]
o Fix Linux compatibility layer incorrect futex handling. [SA-16:03.linux]
o Fix Linux compatibility layer setgroups(2) system call. [SA-16:04.linux]
o Fix TCP MD5 signature denial of service. [SA-16:05.tcp]
o Fix insecure default bsnmpd.conf permissions. [SA-16:06.bsnmpd]

Security:	FreeBSD-SA-16:01.sctp, CVE-2016-1879
Security:	FreeBSD-SA-16:03.linux, CVE-2016-1880
Security:	FreeBSD-SA-16:04.linux, CVE-2016-1881
Security:	FreeBSD-SA-16:05.tcp, CVE-2016-1882
Security:	FreeBSD-SA-16:06.bsnmpd, CVE-2015-5677

git-svn-id: svn://svn.freebsd.org/base/stable/10@293897 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f