Add native Vagrant support

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`

roles/kubernetes/master/tasks/main.yml

@@ -58,7 +58,7 @@
   command: "{{ bin_dir }}/kubectl get ns kube-system"
   register: 'kubesystem'
   changed_when: False
-  ignore_errors: yes
+  failed_when: False
   run_once: yes
 
 - name: wait for the apiserver to be running

roles/kubernetes/secrets/files/.gitignore

@@ -0,0 +1,4 @@
+tokens/*.token
+tokens/known_tokens.csv
+certs/*.pem
+openssl.conf