Update git submodules

* Update docs/submodules/fuel from branch 'master'
  - Merge "Add & fix licensing in README.rst files, align ext"
  - Add & fix licensing in README.rst files, align ext

    Rename all variations of README files to README.rst.
    Fix license headers according to OPNFV Contribution Guidelines [1].

    Markdown syntax will be switched to rst in an ulterior change.

    [1] https://wiki.opnfv.org/display/DEV/Contribution+Guidelines

    Change-Id: I2c71fd62b38f218545507c79c39e07dbd35f7c88
    Signed-off-by: Alexandru Avadanii <Alexandru.Avadanii@enea.com>

diff --git a/docs/submodules/fuel b/docs/submodules/fuel
index 130f9c3..ffdab07 160000 (submodule)
--- a/docs/submodules/fuel
+++ b/docs/submodules/fuel
@@ -1 +1 @@
-Subproject commit 130f9c3be9facc3cef551c6d7781b02260f4f335
+Subproject commit ffdab0773f116f685bcd181a95c331d94fb8422c