[#59526676] tweaked rules for deregistering chef nodes to assume a 'first registered time'
[#59526676] testing and cleanup
[#59526676] more logging, time check
[#59526676] feedback and changes:

- separated timeouts into "init_timeout" and "age"
- switched to using ruby's Logger instead of puts/prints
[#59526676] feedback fix: wrong value on arg check
Merge pull request #2 from Kabam/chef-client-sweeper

Chef client sweeper