Wire up --skip-tags to the overcloud upgrade cli

This is already wired into the ansible-action [1] so this review just
adds skip_tags to the update_nodes workflow which calls that
action. There is a related review in the tripleoclient
Ie7fb8d9a388c6d53a31800406b03ddb8ed426401 that exposes
--skip-tags to the operator and passes it here, and that review
will depend on this one.

[1]  4739027b9e/tripleo_common/actions/ansible.py (L259)
Change-Id: I8544de64d3307e3dc925c1cecf2d9156e31d25a8
(cherry picked from commit dcc73a9856)

workbooks/package_update.yaml

@@ -111,6 +111,7 @@ workflows:
             ANSIBLE_HOST_KEY_CHECKING: 'False'
       - verbosity: 1
       - work_dir: /var/lib/mistral
+      - skip_tags: ''
 
     tags:
       - tripleo-common-managed
@@ -144,6 +145,7 @@ workflows:
           module_path: <% $.module_path %>
           queue_name: <% $.ansible_queue_name %>
           execution_id: <% execution().id %>
+          skip_tags: <% $.skip_tags %>
         on-success:
           - node_update_passed: <% task().result.returncode = 0 %>
           - node_update_failed: <% task().result.returncode != 0 %>