* Fix writing to KVv2 root via `kv put`
The check that adds the API path wasn't taking into account the root,
e.g. if it's mounted at `kv`, `kv` and `kv/` would end up creating an
extra copy of the mount path in front, leading to paths like
`kv/data/kv`.
* Output warnings if they come back and fix a panic in metadata_get
* Also add to metadata put/delete
* Update kv command to use a preflight check
* Make the existing ui endpoint return the allowed mounts
* Add kv subcommand tests
* Enable `-field` in `vault kv get/put` (#4426)
* Enable `-field` in `vault kv get/put`
Fixes#4424
* Unify nil value handling
* Use preflight helper
* Update vkv plugin
* Add all the mount info when authenticated
* Add fix the error message on put
* add metadata test
* No need to sort the capabilities
* Remove the kv client header
* kv patch command (#4432)
* Fix test
* Fix tests
* Use permission denied instead of entity disabled
* Add more cli subcommands
* Add metadata commands
* Add more subcommands
* Update cli
* Move archive commands to delete
* Add helpers for making http calls to the kv backend
* rename cli header
* Format the various maps from kv
* Add list command
* Update help text
* Add a command to enable versioning on a backend
* Rename enable-versions command
* Some review feedback
* Fix listing of top level keys
* Fix issue when metadata is nil
* Add test for lising top level keys
* Fix some typos
* Add a note about deleting all versions
Jeff Mitchell