cmd: Add skeleton ping command (try 2)

[Trey Hunner]

This patch adds a skeleton ping command that simply looks for a -n
parameter and waits for the specified number of seconds.

This skeleton ping command is useful for cmd scripts that depend on
ping as an alternative to "sleep," such as the following:
ping -n 10 -w 1000 127.0.0.1

I have updated the patch to use a more formal method of parameter parsing.
--
Trey Hunner
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