Update git submodules

* Update docs/submodules/sfc from branch 'stable/gambia'
  - Avoid race conditions

    Sometimes the port pair group gets created before port pair was
    committed in openstack. Before creating the port pair group, we check
    that the port pair is already listed by openstack

    Change-Id: Icfd23521859fc5d4e6bb6745be80f79bf9e31a0c
    Signed-off-by: Manuel Buil <mbuil@suse.com>
    (cherry picked from commit 52e86db6e0a3343852c9aabba49dffe3d699d1a0)

diff --git a/docs/submodules/sfc b/docs/submodules/sfc
index d8bf425..d0f4a84 160000 (submodule)
--- a/docs/submodules/sfc
+++ b/docs/submodules/sfc
@@ -1 +1 @@
-Subproject commit d8bf4258bc56fd2fe0484baafb0f1d3cc2933098
+Subproject commit d0f4a84c62358f4d524cdd53d0731d40d0c5db5d