After getting mail from Antonio Bulgheroni [antonio.bulgheroni@gmail.com],
I found out that MySQL and Oracle default ports number not used in ROOT.

Therefore, I made small fix to set default port number for MySQL = 3306 and Oracle = 1521.


git-svn-id: http://root.cern.ch/svn/root/trunk@16384 27541ba8-7e3a-0410-8455-c3a389f83636