Update git submodules

* Update docs/submodules/fuel from branch 'stable/fraser'
  - sysinfo_print: Dump all iptables rules

    Change-Id: I0ce6d21e14efe6e5236759c8d8b3439f09e89675
    Signed-off-by: Alexandru Avadanii <Alexandru.Avadanii@enea.com>
    (cherry picked from commit fa26dabea271cee86c71b95f7d4650ef53eb2419)

diff --git a/docs/submodules/fuel b/docs/submodules/fuel
index c016116..d67d6a8 160000 (submodule)
--- a/docs/submodules/fuel
+++ b/docs/submodules/fuel
@@ -1 +1 @@
-Subproject commit c0161169de2a8e149818c277d19f00fe95d3b1fc
+Subproject commit d67d6a81bf61d3ceee557e9b5dbbfeced09dc4d4