[BSA-107] Security Update for horizon

Thomas Goirand uploaded new packages for horizon which fixed the
following security problem:

CVE-2015-3988:
Sunil Yadav from IBM Security Services reported a persistent XSS in
Horizon. An authenticated user may conduct a persistent XSS attack by
setting a malicious metadata to a Glance image, a Nova flavor or a
Host Aggregate and tricking an administrator to load the update
metadata page. Once executed in a legitimate context this attack may
result in a privilege escalation.

For the jessie-backports distribution the problems have been fixed in
2015.1.0-2~bpo8+1.