Update git submodules

* Update docs/submodules/sfc from branch 'master'
  - Test the deletion of chain

    This is the flow of the test:

    1 - Create a vnffg in tacker (i.e. chain + classifier)
    2 - Remove the vnffg
    3 - Check that the RSPs are removed from operation DB in ODL and
    the classifier rules are not present in the flows
    4 - Create a new vnffg
    5 - Test the new chain:
      5.1 - Check HTTP traffic works
      5.2 - Block HTTP traffic in VNF and check that it does not work anymore

    Change-Id: Ia077e58c5cbce4258a2f8a36f6b961eb923ff9c5
    Signed-off-by: Manuel Buil <mbuil@suse.com>

diff --git a/docs/submodules/sfc b/docs/submodules/sfc
index 7abf19f..575a8c9 160000 (submodule)
--- a/docs/submodules/sfc
+++ b/docs/submodules/sfc
@@ -1 +1 @@
-Subproject commit 7abf19f9cc194213484873770148cf5bc980aefd
+Subproject commit 575a8c98517c587dfdccfad93a6ea119ad689629