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/kubernetes/node/tasks/install.yml

@@ -21,4 +21,3 @@
     dest: "/etc/systemd/system/kubelet.service"
     backup: "yes"
   notify: restart kubelet
-

roles/kubernetes/node/tasks/install_rkt.yml

@@ -20,8 +20,8 @@
     path: /var/lib/kubelet
 
 - name: Create kubelet service systemd directory
-  file: 
-    path: /etc/systemd/system/kubelet.service.d 
+  file:
+    path: /etc/systemd/system/kubelet.service.d
     state: directory
 
 - name: Write kubelet proxy drop-in
@@ -30,4 +30,3 @@
     dest: /etc/systemd/system/kubelet.service.d/http-proxy.conf
   when: http_proxy is defined or https_proxy is defined or no_proxy is defined
   notify: restart kubelet
-