Update git submodules

* Update docs/submodules/releng from branch 'master'
  - Merge "AArch64 Dovetail docker creation job"
  - AArch64 Dovetail docker creation job

    Add support for creating and pulling Dovetail docker container
    for aarch64 platform

    Change-Id: I1e6f2b677e4c972cd80ad2c6f2cd304f0d4d8cad
    Signed-off-by: Alexandru Nemes <alexandru.nemes@enea.com>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index bfb311f..a19708f 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit bfb311fb5e5d38399d6c426e1c0bc7ce0b3cdcdc
+Subproject commit a19708f290905bbb831e7430a1d9a984d5fb6e79