Update git submodules

* Update docs/submodules/sfc from branch 'stable/euphrates'
  - If the VM starts quickly, this check might fail

    Sometimes VM starts very quickly and then it takes longer for this service
    to come up

    Change-Id: Ibc4ea47eb0b4b6655e338d1b85e6ed14e61d0064
    Signed-off-by: Manuel Buil <mbuil@suse.com>
    (cherry picked from commit 95503c8d3aa79e64be4a68348436f3c64dc8464e)

diff --git a/docs/submodules/sfc b/docs/submodules/sfc
index ad1d1bf..5e51b20 160000 (submodule)
--- a/docs/submodules/sfc
+++ b/docs/submodules/sfc
@@ -1 +1 @@
-Subproject commit ad1d1bfd5cf2c2e18248f40169b437861c5abf41
+Subproject commit 5e51b205160f869b94ab2e83815413950ae76631