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`

inventory/inventory.example

@@ -1,29 +1,29 @@
-[kube-master]
-node1 ansible_ssh_host=10.99.0.26
-node2 ansible_ssh_host=10.99.0.27
-
-[etcd]
-node1 ansible_ssh_host=10.99.0.26
-node2 ansible_ssh_host=10.99.0.27
-node3 ansible_ssh_host=10.99.0.4
-
-[kube-node]
-node2 ansible_ssh_host=10.99.0.27
-node3 ansible_ssh_host=10.99.0.4
-node4 ansible_ssh_host=10.99.0.5
-node5 ansible_ssh_host=10.99.0.36
-node6 ansible_ssh_host=10.99.0.37
-
-[paris]
-node1 ansible_ssh_host=10.99.0.26
-node3 ansible_ssh_host=10.99.0.4 local_as=xxxxxxxx
-node4 ansible_ssh_host=10.99.0.5 local_as=xxxxxxxx
-
-[new-york]
-node2 ansible_ssh_host=10.99.0.27
-node5 ansible_ssh_host=10.99.0.36 local_as=xxxxxxxx
-node6 ansible_ssh_host=10.99.0.37 local_as=xxxxxxxx
-
-[k8s-cluster:children]
-kube-node
-kube-master
+#[kube-master]
+#node1 ansible_ssh_host=10.99.0.26
+#node2 ansible_ssh_host=10.99.0.27
+#
+#[etcd]
+#node1 ansible_ssh_host=10.99.0.26
+#node2 ansible_ssh_host=10.99.0.27
+#node3 ansible_ssh_host=10.99.0.4
+#
+#[kube-node]
+#node2 ansible_ssh_host=10.99.0.27
+#node3 ansible_ssh_host=10.99.0.4
+#node4 ansible_ssh_host=10.99.0.5
+#node5 ansible_ssh_host=10.99.0.36
+#node6 ansible_ssh_host=10.99.0.37
+#
+#[paris]
+#node1 ansible_ssh_host=10.99.0.26
+#node3 ansible_ssh_host=10.99.0.4 local_as=xxxxxxxx
+#node4 ansible_ssh_host=10.99.0.5 local_as=xxxxxxxx
+#
+#[new-york]
+#node2 ansible_ssh_host=10.99.0.27
+#node5 ansible_ssh_host=10.99.0.36 local_as=xxxxxxxx
+#node6 ansible_ssh_host=10.99.0.37 local_as=xxxxxxxx
+#
+#[k8s-cluster:children]
+#kube-node
+#kube-master