[COOK-4068] Fix MySQL installation on Windows.

There were a number of items broken in the last refactor of this cookbook. This commit
rewrites the _server_windows recipe to account for a number of things:

* Running mysql commands as not_if guards is unreliable under Windows right now owing
  to CHEF-4783. Because the guard is run as a 32-bit CMD session rather than using
  the SysNative CMD, Windows will lie to you about the exit code and the guard always
  returns 0. As such I elected to use a node attribute to store whether the password
  is set, and use that as a guard.
* Upgrade to the latest version of MySQL 5.5 on the system.
* MySQL data properly belongs in \AppData -- that's what the interactive installer
  will do
* The my.cnf on Windows is called my.ini and it lives in the MySQL server's bin
  directory - again, this is what the "MySQL Instance Creation Wizard", run
  interactively, will do.