Support IMDSv2 / Make shellcheck Happier

Merged Jake Buchholz Göktürk requested to merge github/fork/tomalok/feature/support_IMDSv2 into master

Created by: tomalok

  • get/use Instance MetaData Service v2 token, thanks @junkb (resolves #6 (closed))
  • make shellcheck happier
  • fix installation of multiple SSH keys for EC2_USER
  • use grep -q to detect shebang in user_data

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