Merge branch 'ipv6-oam' into next

Justin Iurman says:

====================

The IOAM patchset was merged recently (see net-next commits [1,2,3,4,5,6]).
Therefore, this patchset provides support for IOAM inside iproute2, as well as
manpage documentation. Here is a summary of added features inside iproute2.

(1) configure IOAM namespaces and schemas:

$ ip ioam
Usage:  ip ioam { COMMAND | help }
        ip ioam namespace show
        ip ioam namespace add ID [ data DATA32 ] [ wide DATA64 ]
        ip ioam namespace del ID
        ip ioam schema show
        ip ioam schema add ID DATA
        ip ioam schema del ID
        ip ioam namespace set ID schema { ID | none }

(2) provide a new encap type to insert the IOAM pre-allocated trace:

$ ip -6 ro ad fc00::1/128 encap ioam6 trace prealloc type 0x800000 ns 1 size 12 dev eth0

  [1] db67f219fc9365a0c456666ed7c134d43ab0be8a
  [2] 9ee11f0fff205b4b3df9750bff5e94f97c71b6a0
  [3] 8c6f6fa6772696be0c047a711858084b38763728
  [4] 3edede08ff37c6a9370510508d5eeb54890baf47
  [5] de8e80a54c96d2b75377e0e5319a64d32c88c690
  [6] 968691c777af78d2daa2ee87cfaeeae825255a58

====================

Signed-off-by: David Ahern <dsahern@kernel.org>