Fix secret-config-kv-prefix-path property

[vsevel]

This changes property quarkus.vault.secret-config-kv-path.singer=multi/singer1,multi/singer2 into quarkus.vault.secret-config-kv-prefix.singer.paths=multi/singer1,multi/singer2 (configuration breaking change)
The original approach (reusing the same name for the prefixed properties and non prefixed properties) seemed to work, but only because the re-parsing of configuration done in the VaultConfigSource was doing the right thing.

Fixes #13276

[vsevel]

hello all, I have squashed commits and rebased. I think the result is looking good thanks for @machi1990 's help.
@sberyozkin feel free to take a look and make sure its matches your expectations.

[sberyozkin]

Hi @vsevel, @machi1990 Thanks, it looks good; @machi1990 thanks for your help :-)

[sberyozkin]

@vsevel, Gradle test is failing, most likely it is unrelated, but please rebase one more time

[machi1990]

Hi @vsevel, @machi1990 Thanks, it looks good; @machi1990 thanks for your help :-)

hello all, I have squashed commits and rebased. I think the result is looking good thanks for @machi1990 's help.
@sberyozkin feel free to take a look and make sure its matches your expectations.

You are welcome :-)

[vsevel]

@sberyozkin build failed again, this time on the Microprofile TCK
is there any way to restart only the failed step?

[vsevel]

@sberyozkin failed build again because of the global timeout set on the maven build (3h). not too sure what I should do.

[sberyozkin]

@vsevel IMHO it is safe to merge this PR as all the Vault tests pass

[vsevel]

thanks to all of you for your assistance in the review and figuring out how to implement the best solution