Update git submodules

* Update docs/submodules/sfc from branch 'master'
  - Pin os_heat role to an older SHA to solve policy problems

    This one follows the logic of this patch [0]

    [0]: https://gerrit.opnfv.org/gerrit/#/c/49327/

    Change-Id: I1b71b9be6db60aa84d20ac14588b70a8e4c52736
    Signed-off-by: Dimitrios Markou <mardim@intracom-telecom.com>

diff --git a/docs/submodules/sfc b/docs/submodules/sfc
index 3d401e3..163aacc 160000 (submodule)
--- a/docs/submodules/sfc
+++ b/docs/submodules/sfc
@@ -1 +1 @@
-Subproject commit 3d401e3c6797711b3216ac04bdbd250a626acd82
+Subproject commit 163aacce943bf07a5603587b9ae681ff9bf4605b