Enable SELinux in swarm bay

SELinux is an important security features. We need to turn it on
after cloud-init. This patch did that for swarm.

Change-Id: I1862a63498613535741c3aae9c0378911ec21315
Partial-Bug: #1543308

magnum/templates/swarm/fragments/disable-selinux.sh

@@ -2,7 +2,3 @@
 #!/bin/sh
 
 setenforce 0
-
-sed -i '
-  /^SELINUX=/ s/=.*/=permissive/
-' /etc/selinux/config

magnum/templates/swarm/fragments/enable-services.sh

@@ -7,3 +7,5 @@ for service in $NODE_SERVICES; do
     systemctl enable $service
     systemctl --no-block start $service
 done
+
+setenforce 1