Update git submodules

* Update docs/submodules/releng from branch 'master'
  to 0e8d4e0c868951f1ae3dce7fb3b78cd5a57785a8
  - Clean all apex artifacts too

    Change-Id: Ia9532529191d0a79d63ebfcf5e6d690f49a67376
    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index 3cd4d94..0e8d4e0 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit 3cd4d944164408fa42b7b8a438b9cae2140a8c26
+Subproject commit 0e8d4e0c868951f1ae3dce7fb3b78cd5a57785a8