Update git submodules

* Update docs/submodules/sfc from branch 'stable/euphrates'
  - Do not use capital letters

    As agreed with the releng-xci guys, we should not use capital letters to refer
    to openstack-ansible (osa)

    Change-Id: I634747b07e72513f751cde3eb33f3b4bad5c176d
    Signed-off-by: Manuel Buil <mbuil@suse.com>

diff --git a/docs/submodules/sfc b/docs/submodules/sfc
index 210edb3..ad1d1bf 160000 (submodule)
--- a/docs/submodules/sfc
+++ b/docs/submodules/sfc
@@ -1 +1 @@
-Subproject commit 210edb3b5d08e820a48bf2b8ecdb336e05804277
+Subproject commit ad1d1bfd5cf2c2e18248f40169b437861c5abf41