Revert "Replace rake functions with python paver functions"

This reverts commit df2e410f2a.

rakelib/devstack_deprecated.rake

@@ -1,25 +0,0 @@
-# devstack tasks deprecated to paver
-
-require 'colorize'
-
-def deprecated(deprecated, deprecated_by,  *args)
-
-    task deprecated, [:system] do |t,args|
-
-        # Need to install paver dependencies for the commands to work!
-        sh("pip install Paver==1.2.1 psutil==1.2.1 lazy==1.1 path.py==3.0.1")
-
-        args.with_defaults(:system => 'lms')
-        deprecated_by = "#{deprecated_by} #{args.system}"
-
-        puts("Task #{deprecated} has been deprecated. Use #{deprecated_by} instead. Waiting 5 seconds...".red)
-        sleep(5)
-        sh(deprecated_by)
-        exit
-    end
-end
-
-deprecated("devstack:start", "paver devstack --fast")
-deprecated("devstack:assets", "paver update_assets --settings=devstack")
-deprecated("devstack:install", "paver install_prereqs")
-deprecated("devstack", "paver devstack")