Delegate the database schema import to monasca_db_setup_host

In order to remove the requirement to install the MariaDB client
libraries on all monasca hosts, we need to isolate all DB actions
on monasca_db_setup_host which has those libraries.

Change-Id: I269a933a7e26a3f4564d18d6f05cfce4b4eafe27

handlers/main.yml

@@ -34,6 +34,7 @@
     name: "{{ monasca_galera_database }}"
     state: import
     target: "/opt/mon_mysql.sql"
+  delegate_to: "{{ monasca_db_setup_host }}"
   no_log: True
 
 - name: Restart monasca services

tasks/monasca_mysql_setup.yml

@@ -44,4 +44,5 @@
     group: root
     mode: 0640
     src: mon_mysql.sql.j2
+  delegate_to: "{{ monasca_db_setup_host }}"
   notify: Create monasca database schema