Use "SHOW TABLES FROM `db`" instead of $dbh->tables() in the
get_list_of_tables() routine.

The symptom is that, when used with recent versions of DBD::mysql,
mysqlhotcopy uses a double-qualified table name, for example:

Invalid db.table name 'test.test`.`x' at /usr/bin/mysqlhotcopy line 855.

This is caused by a change in DBD::mysql.  See this diff:

http://svn.perl.org/viewcvs/modules/DBD-mysql/trunk/lib/DBD/mysql.pm?r1=9183&r2=9188

Basically, older DBD::mysql implemented a limited ->table_info method;
now the full method is implemented, and as a result DBI's ->tables()
method has access to the schema value, so it uses it.