Update git submodules

* Update docs/submodules/fuel from branch 'master'
  - [baremetal] Switch from 1Gb to 2Mb hugepages

    Employ 2Mb hugepages for physical computes as well
    since functest suite uses less than 1Gb memory flavors.

    Change-Id: I7e96dd73df7d9e7274247b4faba15ee9bd362e40
    Signed-off-by: Michael Polenchuk <mpolenchuk@mirantis.com>

diff --git a/docs/submodules/fuel b/docs/submodules/fuel
index 6d90d3b..9facc6f 160000 (submodule)
--- a/docs/submodules/fuel
+++ b/docs/submodules/fuel
@@ -1 +1 @@
-Subproject commit 6d90d3be1fbb7526587a305167e3295bc956d5d4
+Subproject commit 9facc6fd0f6fc844d10f5f1d75bd02bae0f104d8