webadmin: Enable RESTAPI CSRF protection

This patch changes the webadmin application so that it will always
request CSRF protection when creating RESTAPI sessions.

Change-Id: I92c41f18bcbb90441f352444dcc78408e8e61b16
Related: https://bugzilla.redhat.com/1077441
Signed-off-by: Juan Hernandez <juan.hernandez@redhat.com>
(cherry picked from commit 86c27b6f57b9361dce29245324e3eec6314841ef)