Update git submodules

* Update docs/submodules/sfc from branch 'master'
  - Use changed_when instead of the when condition

    The 'when' condition does not make sense and it was added in order to
    avoid the ansible-lint error which requires all command or shell modules
    to use a condition. This can be avoided with changed_when as explained:

    http://willthames.github.io/2016/09/21/using-command-and-shell-in-ansible.html

    Change-Id: I36316ea0848cff9763745af6dd8d8defcd993b70
    Signed-off-by: Manuel Buil <mbuil@suse.com>

diff --git a/docs/submodules/sfc b/docs/submodules/sfc
index 6b95636..9739f4c 160000 (submodule)
--- a/docs/submodules/sfc
+++ b/docs/submodules/sfc
@@ -1 +1 @@
-Subproject commit 6b956361494a573dfcd7e1440b8183e77be94ee4
+Subproject commit 9739f4cfe5ad98ad4811d98e9ae6452f0e55a0be