Update git submodules

* Update docs/submodules/sfc from branch 'master'
  - Add a bit more data to the logging message

    In case of failures, it is hard to understand for what vnf the port
    pair was being created when things went wrong

    Change-Id: I1cfa2553318d910535d45910b2a46d75b2f7926a
    Signed-off-by: Manuel Buil <mbuil@suse.com>

diff --git a/docs/submodules/sfc b/docs/submodules/sfc
index 471a242..fe7d96a 160000 (submodule)
--- a/docs/submodules/sfc
+++ b/docs/submodules/sfc
@@ -1 +1 @@
-Subproject commit 471a2422aa270ebcee562ee7389adffa868f872f
+Subproject commit fe7d96a708927b299ddb939f854b09b3452c5304