Update git submodules

* Update docs/submodules/sfc from branch 'master'
  - Merge "Create vnffgd templates with the new syntax"
  - Create vnffgd templates with the new syntax

    For Queens, tacker uses a different template syntax for the vnffgds

    Change-Id: I3c3bd497f09fcf6af2adc0eaf0f046dad88d88f2
    Signed-off-by: Manuel Buil <mbuil@suse.com>

diff --git a/docs/submodules/sfc b/docs/submodules/sfc
index 2167fff..921d1b0 160000 (submodule)
--- a/docs/submodules/sfc
+++ b/docs/submodules/sfc
@@ -1 +1 @@
-Subproject commit 2167fff07c7ccdeb33e486e43000f2d6c0a207e4
+Subproject commit 921d1b0ce2a9b20ad567251980e536fa6f68c139