DCB-42 Swift "rack awareness"

commit 213438c7ba5a708068b6c81887aee365895b7a32
Author: Sergey Yudin <syudin@mirantis.com>
Date:   Fri Jan 18 16:29:31 2013 +0000

    rack awareness based on switch attribute from crowbar's lldp detection system

Conflicts:
	chef/cookbooks/swift/recipes/ring-compute.rb
	chef/data_bags/crowbar/bc-template-swift.json
some testing feature was enabled before