add xos-core CNAME (CORD-695)

Change-Id: I428fd1e6c7fafcf129b30491ab91ef14b813326f
diff --git a/roles/maas/files/update_dns_template.sh b/roles/maas/files/update_dns_template.sh
index de31f6a..2b006f0 100755
--- a/roles/maas/files/update_dns_template.sh
+++ b/roles/maas/files/update_dns_template.sh
@@ -58,6 +58,7 @@
 \$INCLUDE "/etc/bind/maas/dhcp_harvest.inc"
 $HOSTNAME IN A $LHOST
 xos CNAME $HOSTNAME
+xos-core CNAME $HOSTNAME
 xos-spa-gui CNAME $HOSTNAME
 xos-rest-gw CNAME $HOSTNAME
 onos-cord CNAME $HOSTNAME