Update git submodules

* Update docs/submodules/releng from branch 'master'
  to 2dbb13b16584d5356a1eb992d331bb96bebe715b
  - Enable Airship CNTT gate and daily

    POD  15 has been upgraded to upstream Airship v 1.8. This patch enables
    the gate to check the RC-1 status.

    Updated functest version tag to iruya.

    Change-Id: I5ce57e9c0efe24ac0539e5494cc3acbf81518dff
    Signed-off-by: James Gu <james.gu@att.com>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index 43984be..2dbb13b 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit 43984be3331e2d7b349b44768af296e9df1492bc
+Subproject commit 2dbb13b16584d5356a1eb992d331bb96bebe715b