Update git submodules

* Update docs/submodules/sfc from branch 'master'
  - Adding Dimitris as a committer

    Dimitris has been helping a lot in the 2 previous releases. This last release
    has proven that he is essential to the project adding features like
    multi-installer support and helping debug SFC in both APEX and xci. That's why
    I think he should become committer in the OPNFV-SFC project

    Change-Id: I9fced455db635864cc1ef3523bc6b2bc78d54c5f
    Signed-off-by: Manuel Buil <mbuil@suse.com>

diff --git a/docs/submodules/sfc b/docs/submodules/sfc
index d159cb8..49f2896 160000 (submodule)
--- a/docs/submodules/sfc
+++ b/docs/submodules/sfc
@@ -1 +1 @@
-Subproject commit d159cb8b75f389b5a676e1ea77c57665631f6228
+Subproject commit 49f2896fd90e53e8b8c83cf5e5b22abda7781f54