Update git submodules

* Update docs/submodules/fuel from branch 'master'
  - Revert "[baremetal] Retire mas01 NAT"

    Bring back public internet access to all cluster nodes via NAT
    on mas01 node, required for NTP syncing.

    NOTE: Both mcpcontrol and PXE/admin networks are currently
    hard wired to using /24 netmask, so we leverage that in pxe_nat.sls.

    JIRA: FUEL-348

    This reverts commit 9a6e655e0b851ff6e449027c01ac1a66188b0064.

    Change-Id: I7bab385f95f8c6d92cadc4e2149c2cd56e10c506
    Signed-off-by: Alexandru Avadanii <Alexandru.Avadanii@enea.com>

diff --git a/docs/submodules/fuel b/docs/submodules/fuel
index cf6cd9c..21f34da 160000 (submodule)
--- a/docs/submodules/fuel
+++ b/docs/submodules/fuel
@@ -1 +1 @@
-Subproject commit cf6cd9cd0e00ab1c1165f826a261476b3155268d
+Subproject commit 21f34dab9380f98622c0075fa8f4b5868916a27f