Update git submodules

* Update docs/submodules/sfc from branch 'master'
  - Migrate to SNAPs openstack library

    Functest is deprecating its openstack library which we were using extensively
    We need then to move to an alternative and the best appears to be SNAPs

    Change-Id: Icaa0b9f1ec580545b9d0faa88be2080a310deaf7
    Signed-off-by: Manuel Buil<mbuil@suse.com>

diff --git a/docs/submodules/sfc b/docs/submodules/sfc
index 163aacc..deca6d3 160000 (submodule)
--- a/docs/submodules/sfc
+++ b/docs/submodules/sfc
@@ -1 +1 @@
-Subproject commit 163aacce943bf07a5603587b9ae681ff9bf4605b
+Subproject commit deca6d35cd4ba0c6444b92d15b07ade1169d0ef3