feat: Add common environment overrides to Common Config service

[lenny-goodell]

closes #351

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Testing Instructions

[lenny-goodell]

should we remove common.env?

Not yet. There will be a follow-up PR to do some clean-up once the edgex-go PRs are merged.

can we use use one volume for /kuiper/ instead of so many volumes?

We can look at that, but out of scope for this PR