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-apps/efk/kibana/defaults/main.yml

@@ -1,5 +1,5 @@
 ---
-kibana_cpu_limit: 100m 
+kibana_cpu_limit: 100m
 kibana_mem_limit: 0M
 kibana_cpu_requests: 100m
 kibana_mem_requests: 0M

roles/kubernetes-apps/efk/kibana/meta/main.yml

@@ -1,3 +1,4 @@
+---
 dependencies:
   - role: download
     file: "{{ downloads.kibana }}"

roles/kubernetes-apps/efk/kibana/tasks/main.yml

@@ -1,6 +1,6 @@
 ---
 - name: "Kibana | Write Kibana deployment"
-  template: 
+  template:
     src: kibana-deployment.yml.j2
     dest: "{{ kube_config_dir }}/kibana-deployment.yaml"
   register: kibana_deployment_manifest
@@ -17,7 +17,7 @@
   run_once: true
 
 - name: "Kibana | Write Kibana service "
-  template: 
+  template:
     src: kibana-service.yml.j2
     dest: "{{ kube_config_dir }}/kibana-service.yaml"
   register: kibana_service_manifest