Converge backbeat images

[francoisferrand]

Build federation image as additional layers on top of "standard" backbeat image, to avoid duplication and ensure the image we tested is used in production.
There are still some differences at the moment (e.g. name of user, path) which should be further converged to minimize differences, may be done over time after considering all things.

This allows us to fully control (and minimize) what gets into the image, relying on any official node image. Also, now switch from python-based supervisord to a golang reimplementation [1], to minimize dependencies and CVEs.

Finally, took the change to fix startup command of the image, to ensure it properly propagates OS signals.

[1] https://github.com/ochinchina/supervisord

Issue: BB-633

[bert-e]

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[bert-e]

Waiting for approval

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 54.35%. Comparing base (341880c) to head (b224aa6).

Additional details and impacted files

Components	Coverage Δ
Bucket Notification	15.71% <ø> (ø)
Core Library	61.68% <ø> (ø)
Ingestion	67.53% <ø> (ø)
Lifecycle	46.61% <ø> (ø)
Oplog Populator	84.20% <ø> (ø)
Replication	51.40% <ø> (ø)
Bucket Scanner	85.60% <ø> (ø)

@@               Coverage Diff                @@
##           development/9.0    #2600   +/-   ##
================================================
  Coverage            54.35%   54.35%           
================================================
  Files                  201      201           
  Lines                13336    13336           
================================================
  Hits                  7249     7249           
  Misses                6077     6077           
  Partials                10       10           

Flag	Coverage Δ
api:retry	9.54% <ø> (ø)
api:routes	9.35% <ø> (ø)
bucket-scanner	85.60% <ø> (ø)
ingestion	12.28% <ø> (ø)
lib	7.36% <ø> (ø)
lifecycle	18.82% <ø> (ø)
notification	1.08% <ø> (ø)
replication	18.58% <ø> (ø)
unit	4.98% <ø> (ø)

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