Revert "vault: Fix tests using the new key names"

This was initially changed because the assumption was the vault tests were
directly using the vault backend api. They are not, they are using the web api.

So there was actually nothing to change in the test_vault.py as the web vault
api got fixed and released.

This reverts commit 84e927d2f2ee9d168984c36aa2deda3f8c8bf51a.