Update git submodules

* Update docs/submodules/releng from branch 'master'
  - Merge "fuel, armband: Enable Euphrates jobs & triggers"
  - fuel, armband: Enable Euphrates jobs & triggers

    Change-Id: Id47f61c950e1cc036e32e8efe2e2b55193e7c49e
    Signed-off-by: Alexandru Avadanii <Alexandru.Avadanii@enea.com>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index 6b0e238..d4eb739 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit 6b0e238892d82e5517ef3c1cdf053f869bca4abd
+Subproject commit d4eb739d80d5afe79f1d81e5a88b60bb337e7b69