Update git submodules

* Update docs/submodules/fuel from branch 'master'
  - Merge "lib.sh: rm Ubuntu boot entry on EFI systems"
  - lib.sh: rm Ubuntu boot entry on EFI systems

    On EFI-enabled systems, grub-install from grub-efi-* package
    installs a boot entry named "ubuntu".

    MaaS relies on IPMI to set boot order to PXE first; however
    on systems with buggy firmware or without full IPMI support,
    that fails, leading to booting Ubuntu from hard disk instead.

    Work around this by clearing any previous Ubuntu boot entry
    from board flash, before starting a new baremetal deploy.

    NOTE: This only runs against nodes that are online from a
    previous deploy.

    Closes: ARMBAND-47

    Change-Id: I1c4ece09e42845ce2a1b7119ec69e46e5ca12376
    Signed-off-by: Alexandru Avadanii <Alexandru.Avadanii@enea.com>

diff --git a/docs/submodules/fuel b/docs/submodules/fuel
index 4c0e418..b93f6c9 160000 (submodule)
--- a/docs/submodules/fuel
+++ b/docs/submodules/fuel
@@ -1 +1 @@
-Subproject commit 4c0e4186721a2315ac316f5170c6cd3a8199eb6a
+Subproject commit b93f6c997d9e5c174a1ddaec1c73dedfcdf7c106