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-apps/ansible/tasks/main.yaml

@@ -6,6 +6,7 @@
     - {file: kubedns-svc.yml, type: svc}
   register: manifests
   when: inventory_hostname == groups['kube-master'][0]
+  tags: dnsmasq
 
 - name: Kubernetes Apps | Start Resources
   kube:
@@ -17,11 +18,14 @@
     state: "{{item.changed | ternary('latest','present') }}"
   with_items: "{{ manifests.results }}"
   when: inventory_hostname == groups['kube-master'][0]
+  tags: dnsmasq
 
 - include: tasks/calico-policy-controller.yml
   when: ( enable_network_policy is defined and enable_network_policy == True ) or
     ( kube_network_plugin == 'canal' )
+  tags: [network, canal]
 
 - name: Kubernetes Apps | Netchecker
   include: tasks/netchecker.yml
   when: deploy_netchecker
+  tags: netchecker

roles/kubernetes-apps/network_plugin/meta/main.yml

@@ -2,3 +2,4 @@
 dependencies:
  - role: kubernetes-apps/network_plugin/canal
    when: kube_network_plugin == 'canal'
+   tags: canal