Add support for bastion hosts

cluster.yml

@@ -1,4 +1,9 @@
 ---
+- hosts: localhost
+  gather_facts: False
+  roles:
+    - bastion-ssh-config
+
 - hosts: all
   any_errors_fatal: true
   gather_facts: false
@@ -16,7 +21,7 @@
   any_errors_fatal: true
   gather_facts: true
 
-- hosts: all:!network-storage
+- hosts: all:!network-storage:!bastion
   any_errors_fatal: true
   roles:
     - { role: kubernetes/preinstall, tags: preinstall }