Update git submodules

* Update docs/submodules/releng from branch 'master'
  to 1dc96dc51b0e0326c22d4fff1ea07e6d4f8c8e30
  - Merge "Clean docker proxy configs"
  - Clean docker proxy configs

    It also triggers the jobs on daily basis.

    Change-Id: If4a336b0b5c4d7fd72b20a3ae4833c2323a626c7
    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index fa58f22..1dc96dc 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit fa58f229c41de75e3fd1b44a9a383c5ed539d456
+Subproject commit 1dc96dc51b0e0326c22d4fff1ea07e6d4f8c8e30