Merge FreeBSD EN-20:19-22 SA-20:31-33

Fix execve/fexecve system call auditing. [EN-20:19.audit]
Update timezone database information. [EN-20:20.tzdata]
Fix uninitialized variable in ipfw. [EN-20:21.ipfw]
Fix race condition in callout CPU migration. [EN-20:22.callout]
Fix ICMPv6 use-after-free in error message handling. [SA-20:31.icmp6]
Fix multiple vulnerabilities in rtsold. [SA-20:32.rtsold]
Fix OpenSSL NULL pointer de-reference. [SA-20:33.openssl]