Update git submodules

* Update docs/submodules/releng from branch 'master'
  - [fuel] Handle kubernetes config

    Change-Id: I87b7d74b22341d9c091c16436a9d4a6cfce173d5
    Signed-off-by: Michael Polenchuk <mpolenchuk@mirantis.com>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index 7486614..1a28b61 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit 7486614fbc3e92820c8627bdb6bd7eb252b2ab49
+Subproject commit 1a28b61ccb46ee45dfee6e38fa29aff5c76cb69c