ip: add a simple function so we can use minimal unique subsets
ip: add a simple function so we can use minimal unique subsets

so you can now do things like this:
ip a s
ip ad sh

and so on

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

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