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/master/defaults/main.yml

@@ -1,3 +1,4 @@
+---
 # An experimental dev/test only dynamic volumes provisioner,
 # for PetSets. Works for kube>=v1.3 only.
 kube_hostpath_dynamic_provisioner: "false"
@@ -52,14 +53,14 @@ kube_oidc_auth: false
 ## Variables for OpenID Connect Configuration https://kubernetes.io/docs/admin/authentication/
 ## To use OpenID you have to deploy additional an OpenID Provider (e.g Dex, Keycloak, ...)
 
-#kube_oidc_url: https:// ...
+# kube_oidc_url: https:// ...
 # kube_oidc_client_id: kubernetes
 ## Optional settings for OIDC
 # kube_oidc_ca_file: {{ kube_cert_dir }}/ca.pem
 # kube_oidc_username_claim: sub
 # kube_oidc_groups_claim: groups
 
-##Variables for custom flags
+## Variables for custom flags
 apiserver_custom_flags: []
 
 controller_mgr_custom_flags: []