Update git submodules

* Update docs/submodules/fuel from branch 'master'
  - lib.sh: Fix locals override in nested invocations

    'wait_for' bash function is nested in another 'wait_for' call in some
    places, which leads to inner calls interfering with outer calls by
    overriding the locally scoped variables, including the 'attempt'
    internal counter. In some cases, the outer 'wait_for' would exit
    after a single attempt.

    Fix that by running all contents of `wait_for` inside a subshell,
    which inherits outer calls variables, but does not override them
    when the inner call is finished.

    Change-Id: I450eda3d023af2380c61ee930071fbfc393a5645
    Signed-off-by: Alexandru Avadanii <Alexandru.Avadanii@enea.com>

diff --git a/docs/submodules/fuel b/docs/submodules/fuel
index 496c818..2776ab9 160000 (submodule)
--- a/docs/submodules/fuel
+++ b/docs/submodules/fuel
@@ -1 +1 @@
-Subproject commit 496c818b28b6d668428b3e8996675a7edd688f73
+Subproject commit 2776ab9d850e764a92c30c858befc48e474f6dd4