Update git submodules

* Update docs/submodules/releng from branch 'master'
  to 6b2253fe0008d248f5599f6ef123a55f76336980
  - Merge "Improve kuberef lint script"
  - Improve kuberef lint script

    The OPNFV security audit releng's job prevent to retrieve binaries from
    external sources which results on depending to the binaries provided
    by the OS package managers. This change pretends to cover different
    scenarios where the Jenkins builder is unknown.

    Signed-off-by: Victor Morales <v.morales@samsung.com>
    Change-Id: I37d9b15d3ac9de0b06a96e07eed90f7cc717f444

diff --git a/docs/submodules/releng b/docs/submodules/releng
index a7e1a9d..6b2253f 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit a7e1a9da3dc3505fd375f76216378ca3d25506b3
+Subproject commit 6b2253fe0008d248f5599f6ef123a55f76336980