Update git submodules

* Update docs/submodules/sfc from branch 'master'
  - Remove SNAPs deprecated method

    SNAPs is not supporting get_vm_info() anymore, we should remove it from our lib

    https://gerrit.opnfv.org/gerrit/#/c/53263/4

    Change-Id: Idad1bb60b86c45256bb0a95b6c554e83e6bfae35
    Signed-off-by: Manuel Buil <mbuil@suse.com>

diff --git a/docs/submodules/sfc b/docs/submodules/sfc
index cde9c60..83f6c39 160000 (submodule)
--- a/docs/submodules/sfc
+++ b/docs/submodules/sfc
@@ -1 +1 @@
-Subproject commit cde9c60e0bcb6ba141ce50d913dc138bfca3493d
+Subproject commit 83f6c393d31ed6bb0105380c8c158f4a724189ce