Document Xen Security Advisories (XSAs 185-188, 190-195, 197-198)

PR: 214936
Security: CVE-2016-7092
Security: CVE-2016-7093
Security: CVE-2016-7094
Security: CVE-2016-7154
Security: CVE-2016-7777
Security: CVE-2016-9379
Security: CVE-2016-9380
Security: CVE-2016-9381
Security: CVE-2016-9382
Security: CVE-2016-9383
Security: CVE-2016-9384
Security: CVE-2016-9385
Security: CVE-2016-9386
Security: https://vuxml.FreeBSD.org/freebsd/45ca25b5-ba4d-11e6-ae1b-002590263bf5.html
Security: https://vuxml.FreeBSD.org/freebsd/49211361-ba4d-11e6-ae1b-002590263bf5.html
Security: https://vuxml.FreeBSD.org/freebsd/4aae54be-ba4d-11e6-ae1b-002590263bf5.html
Security: https://vuxml.FreeBSD.org/freebsd/4d7cf654-ba4d-11e6-ae1b-002590263bf5.html
Security: https://vuxml.FreeBSD.org/freebsd/50ac2e96-ba4d-11e6-ae1b-002590263bf5.html
Security: https://vuxml.FreeBSD.org/freebsd/523bb0b7-ba4d-11e6-ae1b-002590263bf5.html
Security: https://vuxml.FreeBSD.org/freebsd/53dbd096-ba4d-11e6-ae1b-002590263bf5.html
Security: https://vuxml.FreeBSD.org/freebsd/5555120d-ba4d-11e6-ae1b-002590263bf5.html
Security: https://vuxml.FreeBSD.org/freebsd/56f0f11e-ba4d-11e6-ae1b-002590263bf5.html
Security: https://vuxml.FreeBSD.org/freebsd/58685e23-ba4d-11e6-ae1b-002590263bf5.html
Security: https://vuxml.FreeBSD.org/freebsd/59f79c99-ba4d-11e6-ae1b-002590263bf5.html