Update git submodules

* Update docs/submodules/sfc from branch 'master'
  - Merge "Add requirements in sfc"
  - Add requirements in sfc

    It now leverages on pbr to scan requirements.txt and inject them into
    the install_requires.

    Change-Id: If51827f6f8839af930c862d846b76b85a778c860
    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>

diff --git a/docs/submodules/sfc b/docs/submodules/sfc
index 49edc1d..483a4c6 160000 (submodule)
--- a/docs/submodules/sfc
+++ b/docs/submodules/sfc
@@ -1 +1 @@
-Subproject commit 49edc1d3a058eb38b768cf9d45c010e61329ad14
+Subproject commit 483a4c6862a56a183a61e61f7dcec6bd574e89b2