Update git submodules

* Update docs/submodules/fuel from branch 'master'
  - Merge "maas: Break infinite loops into finite retries"
  - maas: Break infinite loops into finite retries

    While at it, move the bash commands to a separate script file.

    Change-Id: Ib78b5b7f7083ed866e5d42e8340df7b27198f276
    Signed-off-by: Alexandru Avadanii <Alexandru.Avadanii@enea.com>

diff --git a/docs/submodules/fuel b/docs/submodules/fuel
index 690b6be..7758d6f 160000 (submodule)
--- a/docs/submodules/fuel
+++ b/docs/submodules/fuel
@@ -1 +1 @@
-Subproject commit 690b6bec5695a0d170f47c77244e117fc3d09713
+Subproject commit 7758d6f9fcaa61091c6970d246a9905436aef06b