Updated git submodules

Project: netconf stable/carbon 99561178c9c0ed7facddb49cc504ad6734e56e65

BUG-9132: don't provide a value for restconf/streams/events

The yang type of events leaf is 'type empty', meaning there should be no value.
As of Carbon performing a GET on restconf/streams causes a cast
exception due to the empty string value here. See EmptyJSONCodec in
yangtools.

Change-Id: If0501b9c5459f4255096a4f070968c87a749407e
Signed-off-by: Evan Zeller <evanrzeller@gmail.com>
(cherry picked from commit 9ae46c73bc2437dc1dab54498b3a64c0600fa9e8)

diff --git a/docs/submodules/netconf b/docs/submodules/netconf
index f4b545aa2055500570d736ccfc3b82ffa847cef6..99561178c9c0ed7facddb49cc504ad6734e56e65 160000 (submodule)
--- a/docs/submodules/netconf
+++ b/docs/submodules/netconf
@@ -1 +1 @@
-Subproject commit f4b545aa2055500570d736ccfc3b82ffa847cef6
+Subproject commit 99561178c9c0ed7facddb49cc504ad6734e56e65