Hetzner: support reading user-data that is base64 encoded. (#448)

Hetzner cloud only supports user-data as a string (presumably utf-8).

In order to allow users on Hetzner to provide binary data to cloud-init,
we will attempt to base64decode the userdata.

The change here adds a 'maybe_b64decode' function that will decode data
if and only if is base64 encoded.

The reason for not using util.b64d is that we do not want the return value
decoded to a string, and util.b64d will do that if it can.  Additionally
we call decode with validate=True which oddly is not the default.

LP: #1884071

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