tests: Attempt to reset hostnames via pytest

.travis.yml

@@ -21,10 +21,6 @@ cache:
     - $HOME/.cache/pip
 addons:
   hostname: ca
-  hosts:
-    - ca.example.lan ca
-    - vpn.example.lan
-    - ipsec.example.lan
   apt:
     packages:
     - python-configparser

tests/test_cli.py

@@ -36,6 +36,10 @@ def generate_csr(cn=None):
 def test_cli_setup_authority():
     import shutil
     import os
+    with open("/etc/hosts", "w") as fh:
+        fh.write("127.0.0.1 localhost\n")
+        fh.write("127.0.0.1 ca.example.lan ca\n")
+        fh.write("127.0.0.1 vpn.example.lan\n")
     if os.path.exists("/run/certidude/signer.pid"):
         with open("/run/certidude/signer.pid") as fh:
             try: