Update git submodules

* Update docs/submodules/releng from branch 'master'
  to 7c6eae954b04794c735cd72316f98dd559cf60ca
  - Fix intel-pod[17,18] assignment (Airship)

    It sets Compass baremetal-centos to compass-baremetal-master
    arbitrarily. It should have been cleant prior to new assigment
    and seems safe (CompassNFV doesn't participate to the last releases)

    Change-Id: I08c6a9e0b5996d7f94f7eb0cdc427471878eaf90
    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index d93a6b1..7c6eae9 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit d93a6b1018ac65ab709b866350489bb182766f8f
+Subproject commit 7c6eae954b04794c735cd72316f98dd559cf60ca