This patch adds a ping command to the RTEMS shell. It pings for a count
of 5 or so and then stops because there is not ^C in the RTEMS shell.
A flood ping also works with the -c option. As stated in the commit
message some options work and some do not and I suspect the age of our
TCP/IP stack is
The ping code is taken from a recent FreeBSD release. Some options have been
tested, other not tested or do not work. This could be due to the age of
our TCP/IP stack.
This version of ping will not work if more than 64 file descriptors are
open at once because the select FD size is 64 as set in
