Keystone Pike requires latest python-cryptography

Keystone Pike has to have latest version of python-cryptography,
otherwise it breaks requests on API.

Change-Id: I36313f9c2520bb0fb22511763de65e3437ed6d87
Closes-Bug: PROD-16858
diff --git a/keystone/server/cluster.yml b/keystone/server/cluster.yml
index cbe89ca..0ae502b 100644
--- a/keystone/server/cluster.yml
+++ b/keystone/server/cluster.yml
@@ -12,6 +12,9 @@
         python-pymysql:
           fromrepo: ${_param:openstack_version}
           version: latest
+        python-cryptography:
+          fromrepo: ${_param:openstack_version}
+          version: latest
   keystone:
     server:
       enabled: true