Merge pull request #36 from amazonlinux/pr/33

Print ec2-metadata error to stderr and add missing changelog entry

Add GitHub Actions configuration to run shellcheck automatically

Merge branch 'bugfix-nvme-symlink' into 1.x

#23

Merge branch 'main-udev-bugfix' into main

#24

Update branch details in CONTRIBUTING.md

ec2-metadata: fix several shellcheck issues

Shellcheck reported a number of warnings about unquoted references.
The specific issues were harmless given the context, but adding quotes
helps with consistency.

Additionally, shellcheck identified that the '-h' command line option
was defined twice (for --local-hostname and --help).  Drop one of
these references.

Merge pull request #1 from nmeyerhans/python3

Minor repo cleanup and python3 support