[WIP] First take on adding namespace support to vault. Aim to close #2806

[tmacam]

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• Code compiles correctly
• Created/updated tests
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[yaron2]

@tmacam are you planning to finishing this for 1.12? What else is needed here?

[tmacam]

@tmacam are you planning to finishing this for 1.12? What else is needed here?

No. As I mentioned on my comment on #2806 (comment) there is a way to use enginePath to provide the same functionality as namespaces with the advantage we can test enginePath with open-source Vault whereas namespace isn't testable with open-source Vault. Let me drop this PR.