When setting up stunnel for Perforce, we try to find an available local

port we can open for the local end of the tunnel. The intent of the

logic here was to keep trying until we've found some port, retrying any

time we hit an error trying to open one (usually a result of the port

already being opened).
The logic was flawed. We had the try/finally, but no except, meaning

that the first failure would bubble up out of the function. Retrying

never actually occurred.
This change fixes that, adding an empty except that just lets us

continue again. It also fixes up some bare except: lines, just to

satisfy linters.

Unit tests passed.