(maint) Fix several issues with setup

Fix pathing to nodes.json
Correctly construct rake command
Merge pull request #3 from djm68/mutiple_fixes

(maint) Fix several issues with setup
(maint) Remove 'foo' module

'foo' modules was used to test the setup code with multiple modules;
removed now that integration is working.
(maint) Add post steps clean-up

Post perf tests, we want to sanitize the environment before re-running.
(maint) Add step to fix auth.conf mode/ownership
Merge pull request #4 from djm68/master

Merge Dom's fixes to ChrisP's repo
Merge branch 'master' into feature/master/node-config-files
Add ruby code to parse new node config files

This code needs to be swapped into Dom's 01_config_master.rb
script.  We'll also need to figure out how to make the
path to the scenario config file dynamic.