Fix bug by escaping strings from Nova before displaying them

Fixes bug #1247675

(cherry-picked from commit b8ff480)
Change-Id: I3637faafec1e1fba081533ee020f4ee218fea101
Merge "Fix bug by escaping strings from Nova before displaying them" into stable/grizzly
Merge branch 'stable/grizzly' of https://github.com/openstack/horizon into grizzly/router_rules