Update git submodules

* Update docs/submodules/fuel from branch 'master'
  - Merge "states: maas: Dynamic node count in stop condition"
  - states: maas: Dynamic node count in stop condition

    Change-Id: I7fe8d0c77a1d62e2214fb1089651a639303dd20e
    Signed-off-by: Alexandru Avadanii <Alexandru.Avadanii@enea.com>
    Signed-off-by: Michael Polenchuk <mpolenchuk@mirantis.com>

diff --git a/docs/submodules/fuel b/docs/submodules/fuel
index 45720d1..6e3f9c4 160000 (submodule)
--- a/docs/submodules/fuel
+++ b/docs/submodules/fuel
@@ -1 +1 @@
-Subproject commit 45720d1905fd64105e054fa7c898e7d7369897cc
+Subproject commit 6e3f9c49cf5da481831e5aa51eb5ce7a008186f4