Update git submodules

* Update docs/submodules/releng from branch 'master'
  - Merge "Apex: disable functest for k8s deployment in gate job"
  - Apex: disable functest for k8s deployment in gate job

    Change-Id: I554dd364dbcbef03c4bc54bc026af22f8d95d34f

diff --git a/docs/submodules/releng b/docs/submodules/releng
index 53c4bfe..ef6fc1d 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit 53c4bfef96008d3270c6a970de8b4afc6be7119d
+Subproject commit ef6fc1dc453230fed75e8882455edc62e21b0743