Update git submodules

* Update docs/submodules/fuel from branch 'stable/euphrates'
  - lib.sh: Reduce useless wget dot reporting

    Downloading the base image (usually a few hundred MB) outputs a lot
    of useless dots to show progress. Switch to 1M per dot (from 1K).

    Change-Id: I8c525cad0b46e8ba3a7f6da4dd7f8277a49df91f
    Signed-off-by: Alexandru Avadanii <Alexandru.Avadanii@enea.com>
    (cherry picked from commit 056544990dcdab373c5a12ca1521012e80c404ad)

diff --git a/docs/submodules/fuel b/docs/submodules/fuel
index 82050de..4b26800 160000 (submodule)
--- a/docs/submodules/fuel
+++ b/docs/submodules/fuel
@@ -1 +1 @@
-Subproject commit 82050de5fa77139d8e117683cb3c0084e5b7f250
+Subproject commit 4b268006c62db90cd1081ee57cab3bb30376e506