audit: Send replies in the proper network namespace.

In perverse cases of file descriptor passing the current network
namespace of a process and the network namespace of a socket used by
that socket may differ.  Therefore use the network namespace of the
appropiate socket to ensure replies always go to the appropiate
socket.

Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>

diff --cc include/linux/audit.h
Simple merge

diff --cc kernel/audit.c
Simple merge

diff --cc kernel/auditfilter.c
Simple merge