Update git submodules

* Update docs/submodules/sfc from branch 'stable/fraser'
  - Improve logging and unify how to read from yaml

    vnffgd and vnfd are being parsed in different ways, we should parse them
    in the same way. We could do it directly with safe_load, however, the returned
    object is not easy to read. If we use read() instead, the resturned object is
    easy to read/log. Therefore, this patch combines both options

    Change-Id: I3416933801569a6f57962cd9906726229923136d
    Signed-off-by: Manuel Buil <mbuil@suse.com>
    (cherry picked from commit e122e00cb02adc65870cbb05f394dfc9a0cf55b2)

diff --git a/docs/submodules/sfc b/docs/submodules/sfc
index f33eb59..42b7337 160000 (submodule)
--- a/docs/submodules/sfc
+++ b/docs/submodules/sfc
@@ -1 +1 @@
-Subproject commit f33eb597a176c5e90f8fe3c0de610ed7cb964dc6
+Subproject commit 42b733746dcd155025065a389a5ef7ee28445ca3