Describe the bug
When loading data from vault; keys are prefixed with data, and unexpected keys such as metadataversion exist.

To Reproduce
Follow example in https://github.com/knadh/koanf/blob/master/examples/read-vault/main.go using a vault kv2 secret path

Expected behavior
keys should not be prefixed with data, nor should meta data related keys be included.

Please provide the following information):

• OS: linux
• Koanf Version 2.0.1
• Vault provider version 0.1.1

Additional context
I believe that this is caused by