core: Marshalling regression on fenceNode

Change-Id: If9a1bc5a818a122a75f8f02385cfcfc26b003400
Bug-Url: https://bugzilla.redhat.com/show_bug.cgi?id=1143854
Signed-off-by: pkliczewski <piotr.kliczewski@gmail.com>
(cherry picked from commit 2cdcdbc25aa75809f13ae5d1f840d8227ed4d646)