Updated git submodules

Project: netconf master fd7d440a0b6f6e4f1c5db8025ac283489e0e842f

Use SerializationUtils from sal-clustering-commons

THe SerializationUtils class has been moved from sal-distributed-datastore to
sal-clustering-commons by https://git.opendaylight.org/gerrit/#/c/47637/ so
change usages.

Change-Id: Id279d5c805a400b650cbe2fc8f714c0d1a0794a6
Signed-off-by: Tom Pantelis <tpanteli@brocade.com>

diff --git a/docs/submodules/netconf b/docs/submodules/netconf
index 485d8d0ef7de77ffd15dd2913227a4c368100d1f..fd7d440a0b6f6e4f1c5db8025ac283489e0e842f 160000 (submodule)
--- a/docs/submodules/netconf
+++ b/docs/submodules/netconf
@@ -1 +1 @@
-Subproject commit 485d8d0ef7de77ffd15dd2913227a4c368100d1f
+Subproject commit fd7d440a0b6f6e4f1c5db8025ac283489e0e842f