Adding ability to pip install Ansible at specific git url

[grenzr]

This is useful if you need to install Ansible at a specific git url including branch/tag.

Personally, I needed to pip install the latest stable-1.9 branch of Ansible into my machine to pick up a specific change which hadn't made its way into a released version yet.

Just set ansible_git_url config param in your Vagrantfile for example:

  provisioner = Vagrant::Util::Platform.windows? ? :guest_ansible : :ansible

  config.vm.provision provisioner do |ansible|
    ansible.playbook = "ansible/devbox.yml"
    if provisioner == :guest_ansible
      ansible.ansible_git_url = "https://github.com/ansible/[email protected]"
    end
   ...
  end

[slicedevca]

@grenzr Hi just joined this project as a maintainer. Could you please explain your use case and how you tested your solution so that I can test as well?