Add centos x86 64 support

it's still problematic as the libstdc++.i686 pkg for centos is now newer than the installed x86_64 bit package.  And, they are required(?) to be in sync, and the 64 bit package has some protection against being upgraded.  In theory, i believe, we could specify full versions for any/each of these files to get them to install, but that seems very brittle.  For now, checking in with the list of pkgs, perhaps to be revisited later. 

For our internal purposes, we'll just go with 32 bit centos and avoid this issue.  but, even for that, this cookbook needed to change to run on centos.