[playbook] Share vars for ERP5ish playbooks

@rafael - that's last one of my pre-prepared work for playbooks. Here in order to hide "internal" variables of playbook (like `backend_url_path`) and reuse them between different playbooks.

/reviewed-on !27

playbook/erp5-standalone.yml

@@ -4,16 +4,8 @@
 
   vars:
     software_release_url: https://lab.node.vifib.com/nexedi/slapos/raw/1.0.56/software/erp5/software.cfg
-    frontend_software_release_url: https://lab.node.vifib.com/nexedi/slapos/raw/1.0.56/software/apache-frontend/software.cfg
-    startup_playbook_id: erp5-standalone.yml 
-    playbook_name: erp5
-    request_instance_template: request-erp5.j2
-    request_frontend_template: request-erp5-frontend.j2
-    firewall_setup_template: setup-firewall.j2
-    frontend_master_reference: master-frn-{{ playbook_name }}
-    frontend_slave_reference: slave-srn-{{ playbook_name }}
-    backend_url_path: /tmp/playbook-{{ playbook_name }}-backend-url
-    public_ipv4_path: /tmp/playbook-{{ playbook_name }}-public_ipv4
     bt5_list: erp5_full_text_myisam_catalog erp5_configurator_standard
+    startup_playbook_id: erp5-standalone.yml
+    playbook_name: erp5
   roles:
     - standalone-shared

playbook/roles/standalone-shared/tasks/main.yml

 ---
+  - name: fetch shared vars
+    include_vars: erp5-common.yml
+
   - name: Fetch public IPv4
     shell: ifconfig `route -n | grep '^0\.0\.0\.0' | head -n 1 | awk '{print $NF}'` | { IFS=' :';read r;read r r a r;echo $a; }
     register: public_ipv4

playbook/roles/standalone-shared/vars/erp5-common.yml

+frontend_software_release_url: https://lab.node.vifib.com/nexedi/slapos/raw/1.0.56/software/apache-frontend/software.cfg
+request_instance_template: request-erp5.j2
+request_frontend_template: request-erp5-frontend.j2
+firewall_setup_template: setup-firewall.j2
+frontend_master_reference: master-frn-{{ playbook_name }}
+frontend_slave_reference: slave-srn-{{ playbook_name }}
+backend_url_path: /tmp/playbook-{{ playbook_name }}-backend-url
+public_ipv4_path: /tmp/playbook-{{ playbook_name }}-public_ipv4

playbook/wendelin-standalone.yml

@@ -4,17 +4,9 @@
 
   vars:
     software_release_url: https://lab.node.vifib.com/nexedi/slapos/raw/1.0.56/software/wendelin/software.cfg
-    frontend_software_release_url: https://lab.node.vifib.com/nexedi/slapos/raw/1.0.56/software/apache-frontend/software.cfg
+    bt5_list: erp5_full_text_myisam_catalog erp5_configurator_standard erp5_wendelin_configurator
     startup_playbook_id: wendelin-standalone.yml
     playbook_name: wendelin
-    request_instance_template: request-erp5.j2
-    request_frontend_template: request-erp5-frontend.j2
-    firewall_setup_template: setup-firewall.j2
-    frontend_master_reference: master-frn-{{ playbook_name }}
-    frontend_slave_reference: slave-srn-{{ playbook_name }}
-    backend_url_path: /tmp/playbook-{{ playbook_name }}-backend-url
-    public_ipv4_path: /tmp/playbook-{{ playbook_name }}-public_ipv4
-    bt5_list: erp5_full_text_myisam_catalog erp5_configurator_standard erp5_wendelin_configurator
   roles:
     - standalone-shared
     - { role: package, package_name: socat, package_state: present }