BUG/MEDIUM: log: fix config parse error logging on stdout/stderr or any raw fd

BUG/MEDIUM: log: fix config parse error logging on stdout/stderr or any raw fd

The regression was introduced by commit previous commit 94aab06:
MEDIUM: log: support tcp or stream addresses on log lines.

This previous patch tries to retrieve the used protocol parsing
the address using the str2sa_range function but forgets that
the raw file descriptor adresses don't specify a protocol
and str2sa_range probes an error.

This patch re-work the str2sa_range function to stop
probing error if an authorized RAW_FD address is parsed
whereas the caller request also a protocol.

It also modify the code of parse_logsrv to switch on stream
logservers only if a protocol was detected.