Update git submodules

* Update docs/submodules/fuel from branch 'stable/euphrates'
  - lib.sh: Cache base image(s) between deploys

    Fingerprint and re-use base image artifacts.

    Change-Id: Ic7a73c04e27d25addd50e4e9880619a0028956d3
    Signed-off-by: Alexandru Avadanii <Alexandru.Avadanii@enea.com>
    (cherry picked from commit 1815bdaf0c1765cc1fcb48031f8291409861b0b2)

diff --git a/docs/submodules/fuel b/docs/submodules/fuel
index e5e42d9..d9d2294 160000 (submodule)
--- a/docs/submodules/fuel
+++ b/docs/submodules/fuel
@@ -1 +1 @@
-Subproject commit e5e42d98993bca8810a16c997ead25a898300d69
+Subproject commit d9d2294e96268012c6e1fc2239748ea49d53bbaf