read from ~/.vault-token if applicable
read from ~/.vault-token if applicable

Only if VAULT_TOKEN is not set. If it is, the env var takes precedence.

This is the same behavior currenlty documented at
https://www.vaultproject.io/docs/commands/environment.html

Also verified empirically with the vault v0.6.1 client.

locationlabs/ansible-vault,jhaals/ansible-vault,jhaals/ansible-vault