Add a recipe that can install latest ERP5 SR and test default ERP5 configuration automatically.

/reviewed-on !117

playbook/erp5-standalone-test.yml

+- name: a play that runs entirely on the ansible host
+  hosts: 127.0.0.1
+  connection: local
+
+  vars:
+    software_release_url: https://lab.nexedi.com/nexedi/slapos/raw/master/software/erp5/software.cfg
+    bt5_list: erp5_full_text_myisam_catalog erp5_configurator_standard erp5_scalability_test erp5_auto_configuration
+    startup_playbook_id: erp5-standalone.yml
+    playbook_name: erp5
+    request_instance_template: request-erp5.j2
+    request_frontend_template: request-erp5-frontend.j2
+  roles:
+    - standalone-shared