test: fix remove http proxy

molecule/default/converge.yml

@@ -4,7 +4,6 @@
   roles:
     - ansible-role-swarm
   vars:
-    swarm_proxy_url: http://127.0.0.1:3128
     swarm_manager: true
     swarm_init: true
     swarm_networks:

molecule/default/tests/test_default.py

@@ -14,7 +14,6 @@ def test_default_config_file(host):
   assert path.user == 'root'
   assert path.group == 'root'
   assert path.mode == 0o644
-  assert path.contains('https_proxy=http://127.0.0.1:3128')
 
 def test_service(host):
   service = host.service('docker')