Cherry-pick #7553 to 6.3: Bring back support for really old Docker versions #7567
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Cherry-pick of PR #7553 to 6.3 branch. Original message:
Introducing API version negotiation (#7165) brough support for new
Docker versions, but broke support for versions in EOL.
This change puts old API version (1.22) back on the default fallback,
plus introduces version hardcoding through
DOCKER_API_VERSION
environment variable.
I added some integration tests to check things are working.
Fixes #7542