Update git submodules

* Update docs/submodules/fuel from branch 'stable/euphrates'
  - ci/deploy.sh: Add PDF parsing dependencies

    The following packages are required for PDF parsing:
    - python
    - python-ipaddress
    - python-jinja2

    Note that `python-ipaddress` is not available on older Ubuntu
    distributions (e.g. Trusty), in which case `pip` should be used to
    install it. An alternative would be to use python3 packages.

    Update the installation instructions to specify minimum expected
    requirements on the jump server.

    JIRA: FUEL-292

    Change-Id: I19fdcc163dcfdee45ac6fa3f5e09a28638d6035c
    Signed-off-by: Alexandru Avadanii <Alexandru.Avadanii@enea.com>
    (cherry picked from commit f10bc960eead6c1423ada006a383515279056886)

diff --git a/docs/submodules/fuel b/docs/submodules/fuel
index 4401837..e71bd71 160000 (submodule)
--- a/docs/submodules/fuel
+++ b/docs/submodules/fuel
@@ -1 +1 @@
-Subproject commit 4401837178770d50b2d1579a01fb7e6aaca37907
+Subproject commit e71bd7124aea67df693d58dd8f534bf1ef8cb86c