Update git submodules

* Update docs/submodules/releng from branch 'master'
  - [fuel] verify: Fix project, branch undef refs

    Change-Id: I6b641c87e2672a9e879865baebfa3a58129823f7
    Signed-off-by: Alexandru Avadanii <Alexandru.Avadanii@enea.com>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index 417591e..fd756c0 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit 417591ec5158236ccc3a3ce8dfa6b8ad69ef06b6
+Subproject commit fd756c06081bc5cdecffeb534c881ccede380e63