Add promptless slapos installation playbook

playbook/slapos-base.yml

+- name: a play that runs entirely on the ansible host
+  hosts: 127.0.0.1
+  connection: local
+
+  vars:
+    - computer_name: noname
+    - slapostoken: notoken
+    - interface_name: lo
+    - partition_number: 10
+
+  vars_files:
+    - settings/slapos-master.yml
+
+  roles:
+    - { role: slapos, package_state: present }