Update git submodules

* Update docs/submodules/sfc from branch 'master'
  - Remove the extra logs we added

    Tacker plug-in does not have a problem anymore so we can remove the extra logs
    we added in case of failure

    Change-Id: I3b74d6caee9235ad2e8cc180757d0627770380c2
    Signed-off-by: Manuel Buil <mbuil@suse.com>

diff --git a/docs/submodules/sfc b/docs/submodules/sfc
index 779708a..a13cf9e 160000 (submodule)
--- a/docs/submodules/sfc
+++ b/docs/submodules/sfc
@@ -1 +1 @@
-Subproject commit 779708abf7fbae55c65cc7920d03b79e6801ad1a
+Subproject commit a13cf9ed3c16a41e2638c081b4d27a83bbd191d5