nixosTests.certmgr.{command,systemd}: fix tests

first off, since #158167, the test needs to share the module's
service's `StateDirectory` during setup to work properly.

more importantly, certmgr seems to default to the `authsign` endpoint
instead of `sign` ever since its last update in nixpkgs (#271299).
while I would have liked to somehow disable/revert this behaviour,
it wasn't obvious to me how to.

set up the cfssl server to accept a single authentication key, and tell
certmgr to use that for its requests

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