Remove unnecessary pki step in haproxy install

This step appears to be unnecessary and was left over from
a time before the PKI role was called from within the HAProxy
role. See https://review.opendev.org/c/openstack/openstack-ansible/+/788031/3..4/tests/roles/bootstrap-host/files/user_variables_pki.yml

At present, the lack of a pki_dir variable in this step results
in writes to '/etc/pki' which requires elevated privileges.

Other than creating directories, the default variables do not
result in any certificates being generated in this step.

Depends-On: https://review.opendev.org/c/openstack/openstack-ansible/+/811742/
Change-Id: Id4228b8a587c22583bd0f9253665dcf58db88a5a

playbooks/haproxy-install.yml

@@ -43,12 +43,6 @@
        - "item.when | bool"
       tags:
         - haproxy-config  # this tag is present because the task is ONLY a config task
-    - name: "Create haproxy certificates"
-      include_role:
-        name: pki
-        tasks_from: main_certs.yml
-      vars:
-        pki_search_certificates_pattern: "pki_certificates_haproxy"
   roles:
     - role: "keepalived"
       when: haproxy_use_keepalived | bool