(MAINT) aws_sdk support repairs

- vmhostname was being set incorrectly and breaking PE installation
- move instance metadata tag addition to after instance is running
- /etc/hosts generation fixed so that it has entries for all other hosts
  on each individual host
- add agent listen port (8139)
- fix zombie killing by correctly handling volumes that may not exist
  when attempted deletion occurs
(gh-210) Setting PATH, ignored :environment option

- we do not correctly handle adding additional environment variables to
  puppet commands, this patch allows you to add those env vars