Merge MRO

[michaelsauter]

Merges https://github.com/opendevstack/ods-mro-jenkins-shared-library into this repo, preserving the history of the MRO repo.

Closes opendevstack/ods-mro-jenkins-shared-library#104.

As the diff is impossible to review, here's a summary of what I've done:

• Merge commits (d90641c). There were only a few conflicts. I solved the conflict on the README.md by creating a new document under docs for the orchestration pipeline.
• Rename mroPipeline to odsOrchestrationPipeline (7037ad8)
• Move all packages from MRO in package org.ods into org.ods.orchestration (in 596928b, tests moved in c89e93c)
• Move all "phases" in vars/ to stages in org.ods.orchestration (7e30ebe)
• Make use of the super stage to contain the try/catch logic with reporting back to Jira (dadf8df)
• Move runOnAgentPod into super stage (660a27b)
• Fix issues that occurred due to the merge (5eb4238, and a regression on MRO master in
  313787d)

Far from being complete, but this allows to use the orchestration pipeline like this:

@Library('ods-jenkins-shared-library@master') _
odsOrchestrationPipeline(
  debug: true,
  odsImageTag: 'master'
)

I've recorded a few follow-up items: #272, #273, #274, #275 and #276 which should cover most things related to the merge of the two libraries.

I propose to merge this quickly to unblock contributions to the MRO again.

[clemensutschig]

wonderfull

[metmajer]

Fantastic @michaelsauter! Did you run a release manager pipeline with the new codebase already? Ping me on IM if you like.

[michaelsauter]

@metmajer Yes. Assembling (WIP and version) worked, and promotion as well. I did not test the Jira integration, but since I did not any changes there things should work :)