Revert "Remove /etc/hosts modification in behat setup task"

This reverts commit 9e2dac93.

behat.py

@@ -24,6 +24,7 @@ def init(rewrite=True):
             h.fab_run(role, 'cp example.behat.yml behat.yml')
             h.fab_run(role, 'sed -i "s@%DRUPAL_ROOT@{}@g" behat.yml'.format(site_root))
             h.fab_run(role, 'sed -i "s@%URL@http://{}@g" behat.yml'.format(host))
+            h.fab_run(role, 'echo "127.0.0.1  {}" >> /etc/hosts'.format(host))
 
         print green('Behat is now properly configured. The configuration file is {}/tests/behat/behat.yml'.format(workspace))
     else: