Update git submodules

* Update docs/submodules/sfc from branch 'master'
  - Merge "Improve readability of the tests"
  - Improve readability of the tests

    The method name "create_custom_av" does not clearly say what it is
    doing. Changing it to "create_vnf" clarifies the code better

    Change-Id: Ic3f874bdb22891d348e5609130b8e4f0f3f8c3e8
    Signed-off-by: Manuel Buil <mbuil@suse.com>

diff --git a/docs/submodules/sfc b/docs/submodules/sfc
index ecd8d7c..395db39 160000 (submodule)
--- a/docs/submodules/sfc
+++ b/docs/submodules/sfc
@@ -1 +1 @@
-Subproject commit ecd8d7c0fd1683497e2c2a19199c7becb0b87e6e
+Subproject commit 395db39a951dd60819fabfdc4c74bcd9ca1b19e4