Revert "Parse bridge descriptors in a separate thread."

This reverts commit 8f4cad05500bfc3113713535aa494f8ef5ca878d.
Change `PortList` to `addr.PortList` in bridgedb.Bridges module.
Move Bridges.getConfigLine() documentation into function docstring.
Condense two log calls into one in Bridges.parseExtraInfo().
Add more parser logging to Bridges.parseStatusFile().

 * FIXES part of #9377