Update git submodules

* Update docs/submodules/fuel from branch 'master'
  - Merge "lib.sh: Add delay after `kpartx -av`"
  - lib.sh: Add delay after `kpartx -av`

    On rare occassions, mapper bindings created by kpartx take longer
    to show up, leading to errors when we try to mount them on.
    Bring back the hardcoded delay to bypass such issues.

    Change-Id: Ib386c04fc55cd85235a2156dba08fda378e4cdfd
    Signed-off-by: Alexandru Avadanii <Alexandru.Avadanii@enea.com>

diff --git a/docs/submodules/fuel b/docs/submodules/fuel
index 0892eb1..e016aec 160000 (submodule)
--- a/docs/submodules/fuel
+++ b/docs/submodules/fuel
@@ -1 +1 @@
-Subproject commit 0892eb16c1785703adfb14a5fdea3eb7201d15b7
+Subproject commit e016aec95fb278ae02f0ac96814182dd6a2f50cd