Add class that enables CSRF security

Setting CSRF is enabled through the formula. This
class enables support by default.

PROD-26635

Change-Id: I90648fa0341f9770cc86f36b0f75b4e8249b45a2
(cherry picked from commit bdde59ca3134289958a5c37790bcd63805e902b0)
diff --git a/jenkins/client/init.yml b/jenkins/client/init.yml
index 59faa0b..711c855 100644
--- a/jenkins/client/init.yml
+++ b/jenkins/client/init.yml
@@ -1,8 +1,9 @@
 classes:
-  - service.jenkins.support
-  - service.jenkins.client
-  - system.jenkins.client.approved_scripts
-  - system.jenkins.client.plugins
+- service.jenkins.support
+- service.jenkins.client
+- system.jenkins.client.approved_scripts
+- system.jenkins.client.plugins
+- system.jenkins.client.security.csrf
 parameters:
   _param:
     jenkins_client_user: none