Deal with url without scheme or path in a squidGuard log

Deal with url without scheme or path in a squidGuard log

Some url in a squidGuard log don't start with a scheme:// and may not
even contain a path. Those bare minimum url are not parsed correctly
by the redirector_log_format suggested in sarg.conf.

To parse those log entries correctly, we grab the whole url in the
buffer and strip it down to keep the host name.