added opdk_cass_auth

templates/silent-install.conf.j2

diff --git a/templates/silent-install.conf.j2 b/templates/silent-install.conf.j2
index 1f4ceec..946133c 100644
--- a/templates/silent-install.conf.j2
+++ b/templates/silent-install.conf.j2
@@ -47,6 +47,7 @@
 CASS_HOSTS="{{ cassandra_hosts }}"
 CASS_USERNAME={{ opdk_cass_username }}
 CASS_PASSWORD={{ opdk_cass_password }}
+CASS_AUTH={{ opdk_cass_auth }}
 
 SMTPMAILFROM="{{ opdk_smtp_mail_from }} <{{  opdk_user_email }}>"