netcat: allow it to use any network you can Dial()
netcat: allow it to use any network you can Dial()

we needed this for minimega. It also needs the uroot.Usage patch.

This seems to work to connect to minimega, modulo minimega's brokenness.

Signed-off-by: Ronald G. Minnich <f569d0af9a3481c4007b95c7180d6c41009f2513@gmail.com>

GanShun/u-root,hugelgupf/u-root,rminnich/u-root,rminnich/u-root,rminnich/u-root,hugelgupf/u-root,u-root/u-root,hugelgupf/u-root,u-root/u-root,hugelgupf/u-root,u-root/u-root,rminnich/u-root,GanShun/u-root,GanShun/u-root