community/cloud-init: correct template file, add notes, reduce dependencies

Correct template file for /etc/hosts to order short hostnames first.

Add extra usage notes to README file.

Remove py3-oauthlib and util-linux dependencies.
7 jobs for !14998 with 20.4-release in 1 minute and 25 seconds (queued for 1 second)
detached
Status Job ID Name Coverage
  Lint
failed #255619
docker-alpine x86_64 allowed to fail
lint

00:00:09

 
  Build
failed #255624
docker-alpine ci-build aarch64
build-aarch64

00:00:08

failed #255625
docker-alpine ci-build armv7
build-armv7

00:00:44

failed #255623
docker-alpine ci-build ppc64le
build-ppc64le

00:00:08

failed #255622
docker-alpine ci-build s390x
build-s390x

00:00:09

failed #255621
docker-alpine ci-build x86
build-x86

00:00:05

failed #255620
docker-alpine ci-build x86_64
build-x86_64

00:00:07

 
Name Stage Failure
failed
build-armv7 Build
No job log
failed
build-aarch64 Build
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failed
lint Lint
No job log
failed
build-s390x Build
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failed
build-x86_64 Build
No job log
failed
build-x86 Build
No job log
failed
build-ppc64le Build
No job log