Update git submodules

* Update docs/submodules/fuel from branch 'master'
  - Revert "[baremetal] Fix maas_subnets without maas_fabrics"

    The upstream commit has been merged
    https://github.com/salt-formulas/salt-formula-maas/commit/0c622327
    This reverts commit 2c48915a1a77aa3ac0133155fd0cdadbf280493d.

    Change-Id: Iff86f3dc171371903e3294eed43977eb6197a5e7
    Signed-off-by: Michael Polenchuk <mpolenchuk@mirantis.com>

diff --git a/docs/submodules/fuel b/docs/submodules/fuel
index 8726a0d..2ecb98f 160000 (submodule)
--- a/docs/submodules/fuel
+++ b/docs/submodules/fuel
@@ -1 +1 @@
-Subproject commit 8726a0d7ed8286d1aa86523a4acf61d9d4b4c9cd
+Subproject commit 2ecb98f7e7c67984fd66e2d6b17d5c05c058490b