Fix: Add read_log log_name attr

[cap10morgan]

This has been an optional attribute since forever, but was missing from the docs.

[kriszyp]

Hmm, I wonder if we really want to document this; we don't have clustering stuff anymore and we have been working on increasingly trying to hide/abstract anything to do with the filesystem. I suppose we could include and just say it is only supports hdb.log. We also should change the implementation so that parent directory referencing is restricted/prevented.

[cap10morgan]

Should we just deprecate it instead? And then ignore it if set and only over send back hdb.log from this op?

[kriszyp]

But we recently added the ability to have distinct log files for different components. So it actually is kinda useful again.

[cap10morgan]

But we recently added the ability to have distinct log files for different components. So it actually is kinda useful again.

So maybe change it to something like component and have it default to harper (or similar) when omitted?