Restart mysql when package is installed

When running galera_server role with galera_upgrade=true
it uninstalls mariadb and installs again. In some distros, like CentOS,
mariadb don't start automatically after installation, so upgrade fails.

This patch adds handler on packsage installation, which will be
triggered when package state is changed.

Change-Id: I23811cfaf23007c5da1860e78397be380d67403b
Related-bug: 1628720

tasks/galera_install_apt.yml

@@ -88,6 +88,10 @@
   until: install_remote_apt_packages is success
   retries: 5
   delay: 2
+  notify:
+    - Manage LB
+    - Restart all mysql
+
 
 - name: Remove policy-rc now that the package install is complete
   file:

tasks/galera_install_portage.yml

@@ -25,6 +25,9 @@
   until: install_remote_packages is success
   retries: 5
   delay: 2
+  notify:
+    - Manage LB
+    - Restart all mysql
 
 - name: Ensure mysql config directories exists
   file:

tasks/galera_install_yum.yml

@@ -138,3 +138,6 @@
   until: install_remote_packages is success
   retries: 5
   delay: 2
+  notify:
+    - Manage LB
+    - Restart all mysql

tasks/galera_install_zypper.yml

@@ -92,3 +92,6 @@
   until: install_remote_packages is success
   retries: 5
   delay: 2
+  notify:
+    - Manage LB
+    - Restart all mysql