Minor softwares for use with ucspi-tcp

These are some minor softwares for use with Dan Bernstein's ucspi-tcp.

Changing tcpclient and tcpserver to check their command-line options

This patch modifies the behaviour of tcpclient and tcpserver so that they abort if option arguments are supplied for numbers and IP addresses that cannot be parsed as numbers or IP addresses.

This helps to avoid a common script error where an option argument is accidentally set from an empty environment variable.

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