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Added by Bob Lantz over 10 years ago

Support for control-C. Finally.

I've changed the way things work a bit:

1. netns is replaced by mnexec, a general-purpose mininet helper.

2. For interactive commands, we now use mnexec -p, which prints out
the pid, so we can kill it when someone hits control-C!

3. We close file descriptors for subshells. This might save memory,
but who knows.

4. We detach our subshells from the tty using mnexec -s; thus
control-C should not terminate everything.

5. Given 4, mn -c is now necessary if you kill mininet.