Update git submodules

* Update docs/submodules/fuel from branch 'master'
  - Merge "AArch64: Switch to upstream Saltstack repo"
  - AArch64: Switch to upstream Saltstack repo

    To work around the missing dependency of 'python-tornado' on
    'python-features' provided by the binary-specific DEB package
    in amd64 Saltstack repository, pre-install the req explicitly
    on FN (jumpserver) and VCP VMs via lib.sh.

    JIRA: ARMBAND-382

    Change-Id: I2dbd08a58f6cf57c2c48c2d7fc8d19ad4872e800
    Signed-off-by: Alexandru Avadanii <Alexandru.Avadanii@enea.com>

diff --git a/docs/submodules/fuel b/docs/submodules/fuel
index 0bc600f..b74d99a 160000 (submodule)
--- a/docs/submodules/fuel
+++ b/docs/submodules/fuel
@@ -1 +1 @@
-Subproject commit 0bc600fd4d269a17ebcf28700b46e199d66c25db
+Subproject commit b74d99a145ec87b55b7aa658a4cc5fe7438c4b5c