[NET]: Multiple namespaces in the all dst_ifdown routines.

Move dst entries to a namespace loopback to catch refcounting leaks.

Signed-off-by: Denis V. Lunev <den@openvz.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --cc net/core/dst.c
Simple merge

diff --cc net/ipv4/route.c
Simple merge

diff --cc net/ipv4/xfrm4_policy.c
Simple merge

diff --cc net/ipv6/route.c
Simple merge

diff --cc net/ipv6/xfrm6_policy.c
Simple merge

diff --cc net/xfrm/xfrm_policy.c
Simple merge