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/preinstall/tasks/azure-credential-check.yml

@@ -48,5 +48,3 @@
   fail:
     msg: "azure_route_table_name is missing"
   when: azure_route_table_name is not defined or azure_route_table_name == ""
-
-

roles/kubernetes/preinstall/tasks/main.yml

@@ -1,6 +1,6 @@
 ---
 - include: pre-upgrade.yml
-  tags: [upgrade,  bootstrap-os]
+  tags: [upgrade, bootstrap-os]
 
 - name: Force binaries directory for Container Linux by CoreOS
   set_fact:
@@ -27,14 +27,14 @@
   include_vars: "{{ item }}"
   with_first_found:
     - files:
-      - "{{ ansible_distribution|lower }}-{{ ansible_distribution_version|lower|replace('/', '_') }}.yml"
-      - "{{ ansible_distribution|lower }}-{{ ansible_distribution_release }}.yml"
-      - "{{ ansible_distribution|lower }}-{{ ansible_distribution_major_version|lower|replace('/', '_') }}.yml"
-      - "{{ ansible_distribution|lower }}.yml"
-      - "{{ ansible_os_family|lower }}.yml"
-      - defaults.yml
+        - "{{ ansible_distribution|lower }}-{{ ansible_distribution_version|lower|replace('/', '_') }}.yml"
+        - "{{ ansible_distribution|lower }}-{{ ansible_distribution_release }}.yml"
+        - "{{ ansible_distribution|lower }}-{{ ansible_distribution_major_version|lower|replace('/', '_') }}.yml"
+        - "{{ ansible_distribution|lower }}.yml"
+        - "{{ ansible_os_family|lower }}.yml"
+        - defaults.yml
       paths:
-      - ../vars
+        - ../vars
       skip: true
   tags: facts
 

roles/kubernetes/preinstall/tasks/vsphere-credential-check.yml

@@ -1,3 +1,4 @@
+---
 - name: check vsphere environment variables
   fail:
     msg: "{{ item.name }} is missing"