Add PacketFilter utilities for DNS testing

Add packet filters that are useful for filtering / testing DNS queries
and ARP requests.

This change is a prerequisite for tests verifying DNS and validation
metrics.

Test: tests using these utilities
Bug: 160617623
Bug: 160656765
Change-Id: I4216f4ec60d1a427f60fad6eb8017e36b082665f
1 file changed
tree: a38a768b5f3db1f8efefb7563432f2214ee0c5a3
  1. staticlibs/