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/network_plugin/canal/meta/main.yml

@@ -2,11 +2,16 @@
 dependencies:
   - role: download
     file: "{{ downloads.flannel }}"
+    tags: download
   - role: download
     file: "{{ downloads.calico_node }}"
+    tags: download
   - role: download
     file: "{{ downloads.calicoctl }}"
+    tags: download
   - role: download
     file: "{{ downloads.calico_cni }}"
+    tags: download
   - role: download
     file: "{{ downloads.calico_policy }}"
+    tags: download

roles/network_plugin/canal/tasks/main.yml

@@ -49,6 +49,7 @@
   retries: 4
   delay: "{{ retry_stagger | random + 3 }}"
   changed_when: false
+  tags: [hyperkube, upgrade]
 
 - name: Canal | Copy cni plugins from calico/cni
   command: "/usr/bin/docker run --rm -v /opt/cni/bin:/cnibindir {{ calico_cni_image_repo }}:{{ calico_cni_image_tag }} sh -c 'cp -a /opt/cni/bin/* /cnibindir/'"
@@ -57,3 +58,4 @@
   retries: 4
   delay: "{{ retry_stagger | random + 3 }}"
   changed_when: false
+  tags: [hyperkube, upgrade]