Update git submodules

* Update docs/submodules/fuel from branch 'stable/euphrates'
  - MaaS: Reduce C/D timeouts, minor fixes

    - add new patch for maas.region, extending it poorly with a timeout
      override mechanism; the new comissioning/deploying timeout defaults
      (10/15min) will be used instead of MaaS defaults (20/40min), unless
      reclass params are defined with different values;
    - add 30s delay between 'machine mark-broken' and 'machine mark-fixed'
      MaaS cli commands (fixes a rare race condition);
    - fix forgotten replace in 'maas.pxe_route': s/opnfv_fuel_/opnfv_/g;

    Change-Id: I71c562b80031bac2793dd470d52928c2d62e5300
    Signed-off-by: Alexandru Avadanii <Alexandru.Avadanii@enea.com>
    (cherry picked from commit 01e94712d75c0a1cf7585f0ed380dd9a3967274e)

diff --git a/docs/submodules/fuel b/docs/submodules/fuel
index 1e7d57e..72d9201 160000 (submodule)
--- a/docs/submodules/fuel
+++ b/docs/submodules/fuel
@@ -1 +1 @@
-Subproject commit 1e7d57ed87857c65613f83532d46b5d3721174ef
+Subproject commit 72d9201cb025e3c76df62892d03830863c2d751e