Misleading error message when Besu cannot create parent directories

[MadelineMurray]

When starting Besu will create a directory if the parent directories already exist but will not create parent directories. This is standard behavior that we do not want to change but a better error message would be helpful.

If parent directories are specified that do not exist, startup fails with the following error:

Cannot store generated private key.

This error message should indicate the actual issue: Cannot create multiple directories for $path

Probability: Remote Severity: Marginal