Add VAGRANT_ANSIBLE_TAGS for normal deployment (kubernetes-sigs#8697)

Current ansible.tags 'facts' is for skipping actual Kubespray deployment
at vagrant CI because the deployment takes much time. However the static
'facts' skips the deployment for normal usage of vagrant also.
That causes confusions.

This adds VAGRANT_ANSIBLE_TAGS to skip the deployment for vagrant CI.

Vagrantfile

@@ -75,6 +75,7 @@ $local_path_provisioner_claim_root ||= "/opt/local-path-provisioner/"
 $libvirt_nested ||= false
 # boolean or string (e.g. "-vvv")
 $ansible_verbosity ||= false
+$ansible_tags ||= ENV['VAGRANT_ANSIBLE_TAGS'] || ""
 
 $playbook ||= "cluster.yml"
 
@@ -256,7 +257,9 @@ Vagrant.configure("2") do |config|
           ansible.host_key_checking = false
           ansible.raw_arguments = ["--forks=#{$num_instances}", "--flush-cache", "-e ansible_become_pass=vagrant"]
           ansible.host_vars = host_vars
-          ansible.tags = ['facts']
+          if $ansible_tags != ""
+            ansible.tags = [$ansible_tags]
+          end
           ansible.groups = {
             "etcd" => ["#{$instance_name_prefix}-[1:#{$etcd_instances}]"],
             "kube_control_plane" => ["#{$instance_name_prefix}-[1:#{$kube_master_instances}]"],

test-infra/vagrant-docker/Dockerfile

@@ -5,6 +5,7 @@ FROM quay.io/kubespray/kubespray:${KUBESPRAY_VERSION}
 
 ENV VAGRANT_VERSION=2.2.19
 ENV VAGRANT_DEFAULT_PROVIDER=libvirt
+ENV VAGRANT_ANSIBLE_TAGS=facts
 
 RUN apt-get update && apt-get install -y wget libvirt-dev openssh-client rsync git