Update git submodules

* Update docs/submodules/fuel from branch 'stable/euphrates'
  - Add missing installation dependency

    - uuidgen is required for installation
    - Add installation package for both Debian and
      RHEL based linux distribitions

    Change-Id: I9c9bf04e64dc6be1b4e8fb92aea531eccbea33a5
    Signed-off-by: Taseer Ahmed <taseer94@gmail.com>
    (cherry picked from commit 95835f48cc4a65e5ccc1c48c94fa4caa51e67733)

diff --git a/docs/submodules/fuel b/docs/submodules/fuel
index c75ba4b..1e1c8d4 160000 (submodule)
--- a/docs/submodules/fuel
+++ b/docs/submodules/fuel
@@ -1 +1 @@
-Subproject commit c75ba4b14bf2b5f2b21ebc8705e2e4e60746f960
+Subproject commit 1e1c8d421a2fa3fd28cf4201b17866ff057c84f2