software/caddy-frontend/test: use resource.Session as context manager

this prevents ResourceWarning because this way the sockets are closed

software/caddy-frontend/test/test.py

@@ -499,6 +499,7 @@ def fakeHTTPSResult(domain, path, port=HTTPS_PORT,
   headers.setdefault('Via', 'http/1.1 clientvia')
 
   session = requests.Session()
+  with session:
     if source_ip is not None:
       new_source = source.SourceAddressAdapter(source_ip)
       session.mount('http://', new_source)
@@ -541,6 +542,7 @@ def fakeHTTPResult(domain, path, port=HTTP_PORT,
   headers.setdefault('Via', 'http/1.1 clientvia')
   headers['Host'] = '%s:%s' % (domain, port)
   session = requests.Session()
+  with session:
     if source_ip is not None:
       new_source = source.SourceAddressAdapter(source_ip)
       session.mount('http://', new_source)