Sopma.pm: Fixed a bug where the server is not responding but the
reported connection status appears as COMPLETED instead of
TERMINATED_BY_ERROR (used GOR4 module code as reference)
Inactivated tests for GOR4.t, HNN.t and Sopma.t, since their server
(*.ibcp.fr) is now defunct (not responding and verified that it
does not appear in name server records anymore)
Sopma.t: Added -requires_networking requirement up front (in case
the page or a mirror returns in the future), since its purpose
was to test a server
nexml.t: Added a missing XML::Twig requirement.