Code cleanup (#490)

* fixed :param and :return to @param and @return

* many spelling mistakes fixed

* added bibigrid_version to common configuration

* attempted zabbix linting fix. Needs testing.

* fixed double import

resources/playbook/roles/bibigrid/tasks/011-zabbix-server.yml

@@ -42,8 +42,8 @@
     login_unix_socket: /run/mysqld/mysqld.sock
 
 - name: Check if zabbix schema exists
+  failed_when: false
   shell: "echo describe users | mysql --user={{ zabbix_conf.db_user }} --password={{ zabbix_conf.db_password }} zabbix"
-  ignore_errors: true
   changed_when: false
   register: zabbix_schema_exists
   tags: