Update git submodules

* Update docs/submodules/sfc from branch 'master'
  - Modify the vnfd to use the new image

    We moved to a new image for SFs but we have not moved the name of the image
    in the vnfd

    Change-Id: I8f658e1dfcf0de3117845f615eddb8fd5b1e11af
    Signed-off-by: Manuel Buil <mbuil@suse.com>

diff --git a/docs/submodules/sfc b/docs/submodules/sfc
index 6b02bd1..017e0e8 160000 (submodule)
--- a/docs/submodules/sfc
+++ b/docs/submodules/sfc
@@ -1 +1 @@
-Subproject commit 6b02bd155470f9cb56b79fb038def169dbd477b0
+Subproject commit 017e0e890bf2dfb6a8fe4661e46b2db37d8112e6