conf: Allow user-specified auto-scanned port forwarding ranges

The forwarding table now allows for arbitrary port ranges to be marked as
FWD_SCAN, meaning we don't open sockets for every port, but only those we
scan as listening on the target side.  However, there's currently no way
to create such rules, except -[tTuU] auto which always scans every port
with an unspecified listening address and interface.

Allow user-specified "auto" ranges by moving the parsing of the "auto"
keyword from conf_ports(), to conf_ports_spec() as part of the port
specified.  "auto" can be combined freely with other port ranges, e.g.
    -t 127.0.0.1/auto
    -u %lo/5000-7000,auto
    -T auto,12345
    -U auto,~1-9000

Note that any address and interface given only affects where the automatic
forwards listen, not what addresses we consider when scanning.  That is,
if the target side is listening on *any* address, we will create a forward
on the specified address.

Link: https://bugs.passt.top/show_bug.cgi?id=180
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Reviewed-by: Laurent Vivier <lvivier@redhat.com>
[sbrivio: Fix extra space after if (isdigit(*p)) reported by Laurent]
Signed-off-by: Stefano Brivio <sbrivio@redhat.com>

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