other mysql hosts than localhost not supported atm

defaults/main.yml

@@ -1,4 +1,3 @@
-dovecot_postfixadmin_mysql_host: localhost
 dovecot_postfixadmin_mysql_database: postfixadmin
 dovecot_postfixadmin_mysql_username: dovecot
 dovecot_postfixadmin_mysql_password: koof5DeNgi5aeR2ewoh9iz1u

vars/main.yml

@@ -0,0 +1 @@
+dovecot_postfixadmin_mysql_host: localhost