Return nothing if the Vault token is 'IGNORE-VAULT'
Return nothing if the Vault token is 'IGNORE-VAULT'

We can't get it from the normal ENV, but the Vault library can return it
to us. This means this will even work with the token files.

Signed-off-by: Jo Vandeginste <4367afb03dd6ae2b09a1bd0eea661e2d1b941464@kuleuven.be>

jfroche/hiera-vault