Add tags

Add tags to allow more granular tasks filtering.
Add generator script for MD formatted tags found.
Add docs for tags how-to.

Signed-off-by: Bogdan Dobrelya <bdobrelia@mirantis.com>

roles/kubernetes/node/meta/main.yml

@@ -2,28 +2,39 @@
 dependencies:
   - role: download
     file: "{{ downloads.hyperkube }}"
+    tags: [download, hyperkube, kubelet, network, canal, calico, weave, kube-controller-manager, kube-scheduler, kube-apiserver, kube-proxy, kubectl]
   - role: download
     file: "{{ downloads.pod_infra }}"
+    tags: [download, kubelet]
   - role: kubernetes/secrets
+    tags: k8s-secrets
   - role: download
     file: "{{ downloads.nginx }}"
+    tags: [download, nginx]
   - role: download
     file: "{{ downloads.testbox }}"
+    tags: download
   - role: download
     file: "{{ downloads.netcheck_server }}"
     when: deploy_netchecker
+    tags: [download, netchecker]
   - role: download
     file: "{{ downloads.netcheck_agent }}"
     when: deploy_netchecker
+    tags: [download, netchecker]
   - role: download
     file: "{{ downloads.netcheck_kubectl }}"
     when: deploy_netchecker
+    tags: [download, netchecker]
   - role: download
     file: "{{ downloads.kubednsmasq }}"
     when: not skip_dnsmasq_k8s|default(false)
+    tags: [download, dnsmasq]
   - role: download
     file: "{{ downloads.kubedns }}"
     when: not skip_dnsmasq_k8s|default(false)
+    tags: [download, dnsmasq]
   - role: download
     file: "{{ downloads.exechealthz }}"
     when: not skip_dnsmasq_k8s|default(false)
+    tags: [download, dnsmasq]