Update git submodules

* Update docs/submodules/fuel from branch 'master'
  - Merge "ci/deploy.sh: Add PDF parsing dependencies"
  - 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>

diff --git a/docs/submodules/fuel b/docs/submodules/fuel
index ac4530f..b4c64a0 160000 (submodule)
--- a/docs/submodules/fuel
+++ b/docs/submodules/fuel
@@ -1 +1 @@
-Subproject commit ac4530fa1c89ff1a6af3cec09b3b5de458426bde
+Subproject commit b4c64a0f081b0704742b10ec0ca136ab3b883d12