Use variable for remediation of rule

The rule's extended definition checks are leveragin the variable for the
check, so the remediation should also use it.

applications/openshift/authentication/oauth_or_oauthclient_token_maxage/kubernetes/shared.yml

@@ -5,4 +5,4 @@ metadata:
   name: cluster
 spec:
   tokenConfig:
-    accessTokenMaxAgeSeconds: 28800
+    accessTokenMaxAgeSeconds: {{.var_oauth_token_maxage}}