Feat: formating and remove useless var

roles/collectd/molecule/default/converge.yml

@@ -3,10 +3,9 @@
   become: yes
   hosts: all
   vars:
-    - collectd_network_server: testvagrant
     - collectd_network_server: 192.168.2.240
     - collectd_network_port: 25826
-    
+
   pre_tasks:
     - name: Update apt cache
       apt:

roles/collectd/molecule/default/tests/test_default.py

@@ -1,10 +1,12 @@
 """Role testing files using testinfra."""
 import pytest
 
+
 def test_installed_packages(host):
     collectd = host.package("collectd-core")
     assert collectd.is_installed
 
+
 def test_config(host):
     collectd_config = host.file("/etc/collectd/collectd.conf")
     assert collectd_config.exists
@@ -12,6 +14,7 @@ def test_config(host):
     dtypes = host.file("/usr/share/collectd/types.db")
     assert dtypes.exists
 
+
 def test_service(host):
     collectd = host.service("collectd")
     assert collectd.is_enabled