simplify the installation process by using galaxy_role_file command

[fhenri]

vagrant has the possibility to install directly from the Galaxy role file (https://www.vagrantup.com/docs/provisioning/ansible_common.html#galaxy_role_file)

It saves a step from the manual installation step.

I've been interested by Jenkins, but let me know if you want me to review the other files from the repo and I could update if you're ok.

Great job with the ansible roles and those example files

[geerlingguy]

Oh, nice! I didn't even notice that feature appear in Vagrant, this looks great. Before I commit it, I'd like to update any of the examples that use the requirements file, just to be consistent. If you can't get around to it, I'll try to do it next time I make the rounds on reviewing PRs in this project.

[fhenri]

I've updated the other examples from this repo - I did not test all sub-projects but they all have the same structure
For elk stack, I tested and works ok, the only thing could be to split the requirements file to make 1 specific for log VM and 1 for web. It should be enough to place the installation of galaxy requirement in 1 block but in case you want to create only 1 VM, this would fail. so for now I duplicate the installation of the roles in case you want to create only 1 VM, but ideally, each VM should have its proper requirement file

[geerlingguy]

Thanks! I'm sorry it's taken me so long to get to this, but I shall soon.

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