Update git submodules

* Update docs/submodules/functest from branch 'master'
  - Enable sfc testcase for F-release

    sfc conforms with OpenStack Pike requirements then it could be
    enabled in functest-features and functest-restapi (master) [1].

    [1] https://gerrit.opnfv.org/gerrit/#/c/47279/

    Change-Id: I2b79f918dc4f6ca89c2dca18bf64a4bb184bf8b2
    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>

diff --git a/docs/submodules/functest b/docs/submodules/functest
index 27cd137..6fa563f 160000 (submodule)
--- a/docs/submodules/functest
+++ b/docs/submodules/functest
@@ -1 +1 @@
-Subproject commit 27cd13769905ba0a5545c33ac15f7c523015bb86
+Subproject commit 6fa563f54ff36c091f9f98b17b410e95879ec921