smt-db always create DB user if it doesn't exist

Newer version of mariadb no longer implicitly create db user using grant
statement. For that, create db user if it doesn't exist before granting
database permission (bsc#1228604).

Author: alisarctl

db/smt-db

@@ -302,6 +302,8 @@ sub setup
 	return 7;
     }
 
+    $r = $dbh->do("create user if not exists '$smtuser'\@$host");
+
     $r = $dbh->do("grant all on smt.* to '$smtuser'\@$host identified by '$smtpass'");
     $dbh->disconnect;