Merge branch 'bpf-lpm-delete'

Merge branch 'bpf-lpm-delete'

Craig Gallek says:

====================
Implement delete for BPF LPM trie

This was previously left as a TODO.  Add the implementation and
extend the test to cover it.
====================

Signed-off-by: David S. Miller <davem@davemloft.net>