Audit next branch rebased to v4.17-rc1

[Paul Moore]

Considering some of the proposed changes on the list, e.g. Richard's
audit container ID patches, it seems prudent to bring the audit/branch
forward from v4.15 to v4.17-rc1 so we have a more recent base to work
from. For those of you with patches already posted to the list,
please don't rebase your patches unless I ask.

Thanks.