[step_ca] Rework existing cert variables to be more readable and clear #308
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This change modifies the variables for initializing the CA with an existing key and certificate and makes them more readable.
This also removes the old, confusing behavior that was introduced when the role gained the ability to use both remote and local certificate files as a source. To simplify things, the names of the parameters have been updated and made more explicit.
Tests have also been added to ensure that all three paths (existing local, remote and no previous certificate) all work as expected.
Since this PR changes the names of variables without a fallback, this is a breaking change.
As this only affects initial CA setup, any impact on existing users should be minimal.
Updating the parameter names and values is all that is required for migrating to this new system