Let 'np_net_connect ()' be more verbose when a network error is detected.

This patch will add the IP and port, or socket name, to the error message
and thus simplify the problem debugging: no need to check for this
information in the Nagios configuration.
This function is only used by 'check_tcp.c'.

Without the patch:

$ ./plugins/check_tcp -H 127.0.0.1 -p 21
Connection refused
$ ./plugins/check_tcp -H /var/spool/nagios/cmd/nagios.cmd
Permission denied

With the patch:

$ ./plugins/check_tcp -H 127.0.0.1 -p 21
connect to address 127.0.0.1 and port 21: Connection refused
$ ./plugins/check_tcp -H /var/spool/nagios/cmd/nagios.cmd
connect to socket /var/spool/nagios/cmd/nagios.cmd: Permission denied

Signed-off-by: Davide Madrisan <davide.madrisan@gmail.com>