Update git submodules

* Update docs/submodules/releng from branch 'master'
  - Doctor Hunter stable branch

    Change-Id: If757725b7bb4a10fb87a64942907c73c681084a2
    Signed-off-by: Tomi Juvonen <tomi.juvonen@nokia.com>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index f0199e2..3cbda8a 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit f0199e263cdde2b09b7a00eed071e877a747ef27
+Subproject commit 3cbda8aaa584837eef3957f63c4bdae7e1c98574