Update git submodules

* Update docs/submodules/releng from branch 'master'
  to b949e4555f09b879781c964b65252e5477dbad25
  - Rename sig_network_feature -> sig_network_features

    Change-Id: Ia04d6b09b61b027b428ad10f561163f1bc5844d8
    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index f452f8a..b949e45 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit f452f8afaba33a9f27e416693a01f33e248ea5ec
+Subproject commit b949e4555f09b879781c964b65252e5477dbad25