Update git submodules

* Update docs/submodules/fuel from branch 'master'
  - Merge "ci/deploy.sh: maas: cleanup_uefi on env erase"
  - ci/deploy.sh: maas: cleanup_uefi on env erase

    Running `ci/deploy.sh -EE` should also perform an UEFI boot option
    cleanup, otherwise we risk booting the previously installed OS.

    While at it, reduce delay between nodes removal and fix a rare failure
    for `-EE` when no nodes are defined in MaaS.

    Change-Id: I789ffd3e22545921216f7d5ee3509c76354542eb
    Signed-off-by: Alexandru Avadanii <Alexandru.Avadanii@enea.com>

diff --git a/docs/submodules/fuel b/docs/submodules/fuel
index 2fc4b88..a7fcdb9 160000 (submodule)
--- a/docs/submodules/fuel
+++ b/docs/submodules/fuel
@@ -1 +1 @@
-Subproject commit 2fc4b8890ef1ad456ac1ff421f33e005ae0484be
+Subproject commit a7fcdb99e7b3cc9a2952c07da2e5e17be9f83c0d