Document Xen Security Advisories (XSAs 182, 183, and 184)
PR: 211482
Security: CVE-2016-5403
Security: CVE-2016-6259
Security: CVE-2016-6258
Security: https://vuxml.FreeBSD.org/freebsd/06574c62-5854-11e6-b334-002590263bf5.html
Security: https://vuxml.FreeBSD.org/freebsd/04cf89e3-5854-11e6-b334-002590263bf5.html
Security: https://vuxml.FreeBSD.org/freebsd/032aa524-5854-11e6-b334-002590263bf5.html