Minor changes to netlink code.

1. Remove IpRoute._Debug, since it's identical to the superclass
   version.
2. Add some setsockopt constants to netlink.py.
3. Do the right thing if the kernel returns an error in a dump
   request.

Change-Id: I37e49b35f1366760a408c7c4a73f95164d796a2e
3 files changed