[0023] Updated DB scripts and fixed 0021 SQL file

* Fixed 0021 SQL revision file to create 'dbscripts_on_gossip' table
instead of obsolete 'gossip_scripts' table
* Renamed 'mysql_import' install script to more explicit name 'install'
* Moved 'mysql_cleanup' and 'mysql_dump' scripts to 'utilities'
directory
* Updated 'mysql_dump' and 'mysql_optimize' scripts to run on recent
SQL table updates