title: Openstack devstack installation stalls with git call failure
body: <p>So my Openstack Devstack installation stalls with the following error:</p>
  
  <blockquote>
    <p>./stack.sh:686:install_infra
    /home/mycloud/devstack/lib/infra:45:git_clone
    /home/mycloud/devstack/functions-common:545:git_timed
    /home/mycloud/devstack/functions-common:599:die
    [ERROR] /home/mycloud/devstack/functions-common:599 git call failed: [git clone git://git.openstack.org/openstack/requirements.git /opt/stack/requirements]</p>
  </blockquote>
  
  <p>The solution after a bit of googling is found here: <a href="https://stackoverflow.com/questions/20390267/installing-openstack-errors">Installing Openstack errors</a>
   ... and it works.</p>
  
  <p>My question is what would make the "git" call fail and the "https" one work if git is installed and connectivity to the repository (as well as the rest of the Internet) is present?</p>