* Add vault/api to vendor/
* Adds support for sops publish-ing to Vault
* Adds support for publishing secrets (unencrypted) to Vault
* Adds a new EmitAsMap for TreeBanches
* Adds documentation about sops publish-ing to Vault
* Initial integration/functional test for publishing to vault
It's been around 9 months since our last vendor update. This is also
needed for some new features being worked on for sops workspace.
Additionally, this PR regenerates the kms mocks.
