Update git submodules

* Update docs/submodules/sfc from branch 'master'
  - 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 90b3ef7..191b33f 160000 (submodule)
--- a/docs/submodules/sfc
+++ b/docs/submodules/sfc
@@ -1 +1 @@
-Subproject commit 90b3ef7c16d604e53cce22169822878438ced78a
+Subproject commit 191b33f219150f30f67ee91ef568ac390c7b1a58