Update git submodules

* Update docs/submodules/fuel from branch 'stable/euphrates'
  - [VCP] Catch 'no response' when adding ssh auth key

    On rare occassions, one or more minions might fail to respond in due
    time, so catch 'no reponse' using `wait_for`.

    Change-Id: I8e6b0dc44a39e79c2874ff9a657e152620ba3f13
    Signed-off-by: Alexandru Avadanii <Alexandru.Avadanii@enea.com>
    (cherry picked from commit b254aef5a34c7fc96db5c0a330c757fe9d51be76)

diff --git a/docs/submodules/fuel b/docs/submodules/fuel
index d99a846..9b836d5 160000 (submodule)
--- a/docs/submodules/fuel
+++ b/docs/submodules/fuel
@@ -1 +1 @@
-Subproject commit d99a846e0aaa5b3de1bc2328a45fb4694fe3f1cf
+Subproject commit 9b836d5ac09646319dbd81eff7222186598218a3