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.

Change-Id: I8ebb8ca00b022ae94bafa033110fc365eb673364

handlers/main.yml

@@ -17,14 +17,11 @@
   command: >
     mysql --silent --skip-column-names --connect-timeout=10 -e 'SHOW STATUS LIKE "wsrep_local_state";'
   failed_when: false
-  changed_when: true
+  changed_when: false
   register: node_status
   listen:
     - Restart all mysql
     - cert installed
-  notify:
-    - Bootstrap cluster
-    - Restart mysql (All)
 
 - name: Check if node is in the cluster
   command: >
@@ -32,17 +29,23 @@
   failed_when: false
   changed_when: false
   register: incoming_addresses
-  listen: Bootstrap cluster
+  listen:
+    - Restart all mysql
+    - cert installed
 
 - name: Set incoming addresses fact (primary)
   set_fact:
     galera_incoming_addresses: "{{ (incoming_addresses.stdout.split()[-1] | default('')).split(',') }}"
-  listen: Bootstrap cluster
+  listen:
+    - Restart all mysql
+    - cert installed
 
 - name: Set node status fact
   set_fact:
     galera_cluster_ready: "{{ (galera_wsrep_address_port in galera_incoming_addresses) or ((node_status.stdout.split()[-1] | default(false)) in ['2', '4']) }}"
-  listen: Bootstrap cluster
+  listen:
+    - Restart all mysql
+    - cert installed
 
 - name: Stop mysql
   service:
@@ -50,7 +53,9 @@
     state: stopped
     enabled: yes
   changed_when: true
-  listen: Bootstrap cluster
+  listen:
+    - Restart all mysql
+    - cert installed
   when:
     - galera_install_server | bool
     - not galera_cluster_ready | bool or galera_force_bootstrap | bool
@@ -65,7 +70,9 @@
   when:
     - galera_install_server | bool
     - not galera_cluster_ready | bool or galera_force_bootstrap | bool
-  listen: Bootstrap cluster
+  listen:
+    - Restart all mysql
+    - cert installed
 
 - name: Restart mysql (All)
   service:
@@ -86,10 +93,15 @@
   with_items:
     - "{{ ansible_play_hosts }}"
   run_once: true
-  notify:
-    - Delete encryption keyfile after starting Galera
+  listen:
+    - Restart all mysql
+    - cert installed
 
 - name: Delete encryption keyfile after starting Galera
   file:
     path: "/tmp/.keyfile.key"
     state: absent
+  when: galera_restart is changed
+  listen:
+    - Restart all mysql
+    - cert installed