update to current stable-4.0

Signed-off-by: Thomas Lamprecht <t.lamprecht@proxmox.com>

diff --git a/lxc b/lxc
index 1048d5e1f63979b76a1088eb34cf0aba8b237506..aff7ab782e168bda7a7a422fbe6a04be2cd40a64 160000 (submodule)
--- a/lxc
+++ b/lxc
@@ -1 +1 @@
-Subproject commit 1048d5e1f63979b76a1088eb34cf0aba8b237506
+Subproject commit aff7ab782e168bda7a7a422fbe6a04be2cd40a64