[Hadoop Wiki] Update of "QuickStart" by Erik Gorset

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The "QuickStart" page has been changed by Erik Gorset.
The comment on this change is: Removed ssh-agent tips for mac users which was plain wrong..
http://wiki.apache.org/hadoop/QuickStart?action=diff&rev1=22&rev2=23

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  '''Window Users''' To start ssh server, you need run "ssh-host-config -y" in cygwin enviroment. If he ask for CYGWIN environment value, set it to "ntsec tty". After you can run server from cygwin "cygrunsrv --start sshd" or from Windows command line "net start sshd".
  
- '''Mac Users''' You'll probably need to install something like [[http://www.sshkeychain.org/|SSHKeychain]] or [[http://www.mothersruin.com/software/SSHChain/|SSHChain]] (no idea which is better) to be able to ssh to a computer without having to enter the password every time. This is due to the fact that ssh-agent was designed for X11 systems and OS X isn't an X11 system.
+ '''Mac Users''' In recent versions of OSX ssh-agent is already set up with launchd and keychain. This can be verified by executing "echo $SSH_AUTH_SOCK" in your favorite shell. You can use ssh-add -k and -K to add your keys and passphrases to your keychain.
  
  === Bootstrapping ===
  A new distributed filesystem must be formatted with the following command, run on the master node: