[python3-ldap] Socket errors carried through

[Joseph L. Casale]

> You should get a 'session terminated by server'
> in the connection.last_error attribute after the exception is raised.
>
> Can you check if this is the case?

Well,

that attr has the string value of:

"socket closing error[WinError 10054] An existing connection was forcibly closed by the remote host."

Not so sure we are that much further ahead:)

jlc