Provide custom handler name to PKI role

At the moment PKI and haproxy do listen for the same notify, which results in
haproxy trying to generate certs in inappropriate places. This patch starts
leveraging `pki_handler_cert_installed` variable that enables us to trigger
haproxy certificate assemble only when required and expected.


Co-Authored-By: Damian Dąbrowski <damian@dabrowski.cloud>

Depends-On: https://review.opendev.org/c/openstack/ansible-role-pki/+/875757
Change-Id: I66f648e5c3104f71d6601a493b09f8cdcc3332fc

handlers/main.yml

@@ -23,7 +23,7 @@
     item_base_path: "{{ haproxy_ssl_cert_path ~ '/haproxy_' ~ ansible_facts['hostname'] ~ '-' ~ item_name }}"
   with_items: "{{ haproxy_tls_vip_binds }}"
   listen:
-    - cert installed
+    - haproxy cert installed
 
 - name: regenerate maps
   vars:

tasks/main.yml

@@ -52,6 +52,7 @@
     pki_regen_cert: "{{ haproxy_pki_regen_cert }}"
     pki_certificates: "{{ haproxy_pki_certificates }}"
     pki_install_certificates: "{{ haproxy_pki_install_certificates }}"
+    pki_handler_cert_installed: "haproxy cert installed"
   when:
     - haproxy_ssl | bool