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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/docker/tasks/main.yml

@@ -12,6 +12,7 @@
       paths:
       - ../vars
       skip: true
+  tags: facts
 
 - name: check for minimum kernel version
   fail:
@@ -20,6 +21,7 @@
           {{ docker_kernel_min_version }} on
           {{ ansible_distribution }}-{{ ansible_distribution_version }}
   when: (ansible_os_family != "CoreOS") and (ansible_kernel|version_compare(docker_kernel_min_version, "<"))
+  tags: facts
 
 - name: ensure docker repository public key is installed
   action: "{{ docker_repo_key_info.pkg_key }}"
@@ -76,4 +78,4 @@
     enabled: yes
     state: started
   with_items:
-    - docker
+    - docker

roles/docker/tasks/non-systemd.yml

@@ -4,19 +4,23 @@
   set_fact:
     docker_options_file: >-
       {%- if ansible_os_family == "Debian" -%}/etc/default/docker{%- elif ansible_os_family == "RedHat" -%}/etc/sysconfig/docker{%- endif -%}
+  tags: facts
 
 - name: Set docker options config variable name
   set_fact:
     docker_options_name: >-
       {%- if ansible_os_family == "Debian" -%}DOCKER_OPTS{%- elif ansible_os_family == "RedHat" -%}other_args{%- endif -%}
+  tags: facts
 
 - name: Set docker options config value to be written
   set_fact:
     docker_options_value: '"{{ docker_options }} $DOCKER_NETWORK_OPTIONS $DOCKER_STORAGE_OPTIONS $INSECURE_REGISTRY"'
+  tags: facts
 
 - name: Set docker options config line to be written
   set_fact:
     docker_options_line: "{{ docker_options_name }}={{ docker_options_value }}"
+  tags: facts
 
 - name: Set docker proxy lines to be written
   set_fact:
@@ -24,6 +28,7 @@
      - { name: "HTTP_PROXY", value: '"{{ http_proxy }}"' }
      - { name: "HTTPS_PROXY", value: '"{{ https_proxy }}"' }
      - { name: "NO_PROXY", value: '"{{ no_proxy }}"' }
+  tags: facts
 
 - name: Remove docker daemon proxy config lines that don't match desired lines
   lineinfile:
@@ -58,4 +63,4 @@
     mode: 0644
   notify: restart docker
 
-- meta: flush_handlers
+- meta: flush_handlers