Update git submodules

* Update docs/submodules/fuel from branch 'stable/euphrates'
  - Merge "[baremetal] package: install python-yaml" into stable/euphrates
  - [baremetal] package: install python-yaml

    - Required for PDF parsing

    Change-Id: I95205e62efab3e9920687866d3a53a135828a218
    Signed-off-by: Taseer Ahmed <taseer94@gmail.com>

diff --git a/docs/submodules/fuel b/docs/submodules/fuel
index e2433b3..c116feb 160000 (submodule)
--- a/docs/submodules/fuel
+++ b/docs/submodules/fuel
@@ -1 +1 @@
-Subproject commit e2433b3d8908086cf3ba6ae04ee9d06bf7306bef
+Subproject commit c116feb5ee3f7535fa737bb81d7a288cc6d434b9