Update git submodules

* Update docs/submodules/releng from branch 'master'
  to c8c8fdd1dc96d495ded25a121593f5e5066e9786
  - Merge "Fix kubernetes config matrices"
  - Fix kubernetes config matrices

    Change-Id: I45ab73eabf58794e7b3f8cdb8508a8cb678646f8
    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index a3dbe37..c8c8fdd 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit a3dbe37e1ba9b9cb660de890891dfaae4cce9431
+Subproject commit c8c8fdd1dc96d495ded25a121593f5e5066e9786