Use first uppercase letter for all handlers

This will unify all the handlers to use first uppercase letter for
ansible-lint to stop complaining.

I went through all `notify:` occurrences and fixed them by running
```
set TEXT "text_to_replace"; set REPLACEMENT "replacement_text"; git grep
-rlz "$TEXT" . | xargs -0 sed -i "s/$TEXT/$REPLACEMENT/g"
```

Then I went through all the changes and removed the ones that wasn't
expected to be changed.

Fixes https://pagure.io/fedora-infrastructure/issue/12391

Signed-off-by: Michal Konecny <mkonecny@redhat.com>

roles/mariadb_server/tasks/main.yml

@@ -25,7 +25,7 @@
     - my.cnf.{{ ansible_distribution_version }}
     - my.cnf.default
   notify:
-    - restart mariadb
+    - Restart mariadb
 
 - name: Enable and start mariadb database
   service: name=mariadb enabled=yes state=started