Do not use notify inside handlers

Since latest ansible handlers are not triggered inside the same
handlers flush, which means that triggering mysql restart
the way we did does not work anymore. So instead of
notifying inside handlers, we add listen key to tasks
that are triggered by these newly produced notifications.

This could be due to the bug [1], but ansible-core version that has
backport included still shows inconsistent behaviour

[1] https://github.com/ansible/ansible/issues/80880

Change-Id: I33a590e329cd455c9357d569867247f723d8a64a

roles/ssh_keypairs/handlers/main.yml

@@ -17,9 +17,10 @@
     src: "/etc/ssh/trusted_ca.d/"
     dest: "{{ ssh_keypairs_trusted_ca_file }}"
     mode: "0644"
-  notify: Reload sshd
 
 - name: Reload sshd
   service:
     name: "sshd"
     state: reloaded
+  listen:
+    - Regenerate trusted_ca file