Revert "perf(docker): Fix for ConcurrentHashMap cast error. Added unit tests"

[mrampton]

Reverts #3942

[mrampton]

Hi @ezimanyi -- our integration tests have not been happy with this commit. Would you mind reverting it? We will revise and test internally -- and then push out a new PR when we are happy with the results.

I'll send you a second message for the commit which was cherry-picked into 1.15.x.

Thanks!

[spinnakerbot]

The following commits need their title changed:

• 162065a: Revert "perf(docker): Fix for ConcurrentHashMap cast error. Added unit tests (perf(docker): Fix for ConcurrentHashMap cast error. Added unit tests #3942)"

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