travis: Set FQDN in advance

.travis.yml

@@ -11,6 +11,7 @@ install:
   - sudo pip3 install -r requirements.txt
   - sudo pip3 install codecov pytest-cov requests-kerberos
   - sudo pip3 install -e .
+  - echo 127.0.1.1 ca.example.lan ca | sudo tee -a /etc/hosts
 script:
   - sudo find /home/ -type d -exec chmod 755 {} \; # Allow certidude serve to read templates
   - sudo coverage run --parallel-mode --source certidude -m py.test tests