Adding yamllinter to ci steps (#1556)

* Adding yaml linter to ci check

* Minor linting fixes from yamllint

* Changing CI to install python pkgs from requirements.txt

- adding in a secondary requirements.txt for tests
- moving yamllint to tests requirements

roles/kubespray-defaults/defaults/main.yaml

@@ -1,3 +1,4 @@
+---
 ## Required for bootstrap-os/preinstall/download roles and setting facts
 # Valid bootstrap options (required): ubuntu, coreos, centos, none
 bootstrap_os: none
@@ -88,8 +89,10 @@ kube_network_node_prefix: 24
 
 # The port the API Server will be listening on.
 kube_apiserver_ip: "{{ kube_service_addresses|ipaddr('net')|ipaddr(1)|ipaddr('address') }}"
-kube_apiserver_port: 6443 # (https)
-kube_apiserver_insecure_port: 8080 # (http)
+# https
+kube_apiserver_port: 6443
+# http
+kube_apiserver_insecure_port: 8080
 
 # Path used to store Docker data
 docker_daemon_graph: "/var/lib/docker"

roles/kubespray-defaults/tasks/main.yaml

@@ -1,3 +1,4 @@
+---
 - name: Configure defaults
   debug:
     msg: "Check roles/kubespray-defaults/defaults/main.yml"