General: store command customization in handlers configuration.

--- handlers/mysql.in.orig	Mon Jun 12 20:36:26 2006
+++ handlers/mysql.in	Mon Jun 12 20:36:28 2006
@@ -18,6 +18,9 @@
 getconf dbpassword
 getconf configfile /etc/mysql/debian.cnf
 
+getconf MYSQL /usr/bin/mysql
+getconf MYSQLHOTCOPY /usr/bin/mysqlhotcopy
+getconf MYSQLDUMP /usr/bin/mysqldump
 
 # Decide if the handler should operate on a vserver or on the host.
 # In the former case, check that $vsname exists and is running.