Remove deprecated (and removed in 1.19) flag and function --basic-auth-file (#6655)

docs/getting-started.md

@@ -95,7 +95,7 @@ the Kubernetes [documentation](https://kubernetes.io/docs/tasks/access-applicati
 
 Supported version is kubernetes-dashboard v2.0.x :
 
-- Login options are : token/kubeconfig by default, basic can be enabled with `kube_basic_auth: true` inventory variable - not recommended because this requires ABAC api-server which is not tested by kubespray team
+- Login option : token/kubeconfig by default
 - Deployed by default in "kube-system" namespace, can be overridden with `dashboard_namespace: kubernetes-dashboard` in inventory,
 - Only serves over https
 

docs/vars.md

@@ -209,11 +209,3 @@ in the form of dicts of key-value pairs of configuration parameters that will be
 
 * *helm_version* - Defaults to v3.x, set to a v2 version (e.g. `v2.16.1` ) to install Helm 2.x (will install Tiller!).
 Picking v3 for an existing cluster running Tiller will leave it alone. In that case you will have to remove Tiller manually afterwards.
-
-## User accounts
-
-The variable `kube_basic_auth` is false by default, but if set to true, a user with admin rights is created, named `kube`.
-The password can be viewed after deployment by looking at the file
-`{{ credentials_dir }}/kube_user.creds` (`credentials_dir` is set to `{{ inventory_dir }}/credentials` by default). This contains a randomly generated
-password. If you wish to set your own password, just precreate/modify this
-file yourself or change `kube_api_pwd` var.