NO-ISSUE: add more changelog details to PR descriptions

[dhellmann]

• Reformat the changelog as nested lists so it looks a bit nicer in the PR
  descriptions for rebases.
• Add full changelog to rebase PR descriptions

[openshift-ci-robot]

@dhellmann: This pull request explicitly references no jira issue.

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In response to this:

• Reformat the changelog as nested lists so it looks a bit nicer in the PR
  descriptions for rebases.
• Add full changelog to rebase PR descriptions

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[dhellmann]

/assign @pmtk

[pmtk]

/lgtm

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: dhellmann, pmtk

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[openshift-ci]

@dhellmann: all tests passed!

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