add kubernetes volumes subPath support
What does this MR do?
Add kubernetes Volumes subPath support
Why was this MR needed?
For some situation, we only need to cover one config file.
Are there points in the code the reviewer needs to double check?
No
Does this MR meet the acceptance criteria?
Yes
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Documentation created/updated - Tests
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Added for this feature/bug -
All builds are passing
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Branch has no merge conflicts with master(if you do - rebase it please)