Merge branch 'getpeername'

Daniel Borkmann says:

====================
Trivial patch to add get{peer,sock}name cgroup attach types to the BPF
sock_addr programs in order to enable rewriting sockaddr structs from
both calls along with libbpf and bpftool support as well as selftests.

Thanks!

v1 -> v2:
  - use __u16 for ports in start_server_with_port() signature and in
    expected_{local,peer} ports in the test case (Andrey)
  - Added both Andrii's and Andrey's ACKs
====================

Signed-off-by: Alexei Starovoitov <ast@kernel.org>