ansible 2.2.2.0 has an [issue]() that causes problems for kargo:
```
(env) kargo ᐅ env/bin/ansible-playbook upgrade-cluster.yml
ERROR! Unexpected Exception: 'Host' object has no attribute 'remove_group'
```
Pinning ansible to 2.2.1.0 resolved this for me.
Ansible 2.2.1 requires jinja2<2.9, see <https://github.com/ansible/ansible/blob/v2.2.1.0-1/setup.py#L25>,
but without explicit limiting upper jinja2 version here pip ignores
Ansible requirements and installs latest available jinja2
(pip is not very smart here), which is incompatible with with
Ansible 2.2.1.
With incompatible jinja2 version "ansible-vault create" (and probably other parts)
fails with:
ERROR! Unexpected Exception: The 'jinja2<2.9' distribution was not found
and is required by ansible
This upper limit should be removed in 2.2.2 release, see:
<978311bf3f>
This allows you to simply run `vagrant up` to get a 3 node HA cluster.
* Creates a dynamic inventory and uses the inventory/group_vars/all.yml
* commented lines in inventory.example so that ansible doesn't try to use it.
* added requirements.txt to give easy way to install ansible/ipaddr
* added gitignore files to stop attempts to save unwated files
* changed `Check if kube-system exists` to `failed_when: false` instead of
`ignore_errors`
