Update git submodules

* Update docs/submodules/sfc from branch 'stable/fraser'
  - Fix version in setup.cfg

    Selecting another tag than the official ones (opnfv-xxx) breaks all
    Functest builds because pbr requirements are unmet [1].

    [1] https://build.opnfv.org/ci/job/functest-features-docker-build-amd64-master/219/console

    Change-Id: I8a6a603c9f4e976c8bcdcce865850b46f6e69453
    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>

diff --git a/docs/submodules/sfc b/docs/submodules/sfc
index 0844466..3f77ff5 160000 (submodule)
--- a/docs/submodules/sfc
+++ b/docs/submodules/sfc
@@ -1 +1 @@
-Subproject commit 084446656bf2794a11de56b782f589af1f703487
+Subproject commit 3f77ff56f24660500cec13f0953d462ea2cd4948