[prometheus] Define Prometheus Nginx exporter address globally to make easier the separation saclay/cachan

Signed-off-by: Yohann D'ANELLO <ynerant@crans.org>

group_vars/all/prometheus_nginx_exporter.yaml

@@ -0,0 +1,3 @@
+---
+glob_prometheus_nginx_exporter:
+  listen_addr: "{{ query('ldap', 'ip', ansible_hostname, 'adm') | ipv4 | first }}"

group_vars/cachan/prometheus_nginx_exporter.yaml

@@ -1,3 +1,3 @@
 ---
-loc_prometheus_nginx_exporter:
+glob_prometheus_nginx_exporter:
   listen_addr: "{{ query('ldap', 'ip', ansible_hostname, 'cachan-adm') | ipv4 | first }}"

group_vars/nginx.yml

@@ -30,6 +30,3 @@ glob_nginx:
     - "172.16.0.0/16"
     - "fd00::/56"
   deploy_robots_file: false
-
-glob_prometheus_nginx_exporter:
-  listen_addr: "{{ query('ldap', 'ip', ansible_hostname, 'adm') | ipv4 | first }}"