PT-2340 - Support MySQL 8.4

- Removed offensive terminology from library files and their tests
- Removed unused sandbox/prove2junit.pl
- Added option mysql_ssl to DSN and possibility to have DSN of multiple letters

t/lib/MySQLConfig.t

@@ -19,7 +19,7 @@ use PerconaTest;
 
 my $dp  = new DSNParser(opts=>$dsn_opts);
 my $sb  = new Sandbox(basedir => '/tmp', DSNParser => $dp);
-my $dbh = $sb->get_dbh_for('master');
+my $dbh = $sb->get_dbh_for('source');
 
 use Data::Dumper;
 $Data::Dumper::Indent    = 1;