update to current upstream master

to save Alexandre some backport work

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

diff --git a/ifupdown2 b/ifupdown2
index 09f9afc782b6a0fec782540a421bad7814a433ba..e1aa03b0314d55e1175f0f1bf8859f048d52e4f8 160000 (submodule)
--- a/ifupdown2
+++ b/ifupdown2
@@ -1 +1 @@
-Subproject commit 09f9afc782b6a0fec782540a421bad7814a433ba
+Subproject commit e1aa03b0314d55e1175f0f1bf8859f048d52e4f8