Update git submodules

* Update docs/submodules/sfc from branch 'stable/euphrates'
  - Add tacker to the scenario role

    Change-Id: I0d6f48eff3edd7e1117ec0c5f7f16c1de35300d5
    Signed-off-by: Manuel Buil <mbuil@suse.com>
    (cherry picked from commit 72121b19a9c12961afdfd6ee7d4fe3eff95d8b10)

diff --git a/docs/submodules/sfc b/docs/submodules/sfc
index 93be25b..6e9d48e 160000 (submodule)
--- a/docs/submodules/sfc
+++ b/docs/submodules/sfc
@@ -1 +1 @@
-Subproject commit 93be25b50c49c45b6913202ff5fb009d430f37c6
+Subproject commit 6e9d48e057bea03dd5914b54e191a745bb730029