Remove obsolete find_orphan_ec2_nodes function
Underlying load-balancer functions
Generic virtual IP management facade for ElasticIP logic
Tweaks to underlying load-balancer functions
Rolling strategy now load balancer and virtual ip aware.
Add helper functions for Debian package management and stage-and-flip deployment
Default group to same as user.
Bug fixes to ELB interactions.
Conslidate node classification into single function to fix bugs.
Fix bug in env.bools processing
Distinguish between empty list and no argument
Fix bug when no datadog tags specified