Update git submodules

* Update docs/submodules/releng from branch 'master'
  to e68f0d5ccca1215080e34a7e905bba1e7ddec6cb
  - Remove useless blank lines

    Change-Id: Ie0131996d5fdc48cc294732071d70e522f89da54
    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index 7a5d648..e68f0d5 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit 7a5d6483138a1f6e5bb183d68689b42aa74209ba
+Subproject commit e68f0d5ccca1215080e34a7e905bba1e7ddec6cb