Ncat -w -i options bugfixing

[Carlos Manso <carlos.manso () gmail com>]

Hello, I'm Carlos Manso, a GSoC aspirant. I applied for bugfixing and
developing new features. Right now I'm trying to solve a bug to get my
hands a little dirty (https://github.com/nmap/nmap/issues/798).
The problem is that -w options doesn't do the same as good ol' nc. As far
as I know nc -w just waits in listen mode for the seconds you want and if
no connection is done it ends. In ncat the -w option as no effect at all,
it is passed between some functions but get lost at the end, when trying to
make a connection, as I could grasp from reading the code.

> From the docs we have:

The --idle-timeout option and it synonym -i allow setting a timeout for
reads and writes in connect mode. If the client fails to read or write for
the given time period, the connection is dropped. These options do not work
in listen mode.

The --wait (or -w for short) option sets how long Ncat will wait for a
connection to be established in connect mode. The default is 10 seconds.
if I'm right, -w option should be implemented, and should work only in
listen mode, not in connect mode(as nc does, so the doc should be changed).
Also -i option does work in listening mode in ncat, and this should be
fixed as well, being only valid in connection mode, as the doc says, or
change the doc.

Thanks for reading, and sorry if I'm wrong.

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