Update git submodules

* Update docs/submodules/fuel from branch 'master'
  - Merge "Revert "Revert "Select the fastest mirror of repos"""
  - Revert "Revert "Select the fastest mirror of repos""

    This reverts commit 7785a18f592ecd6eeb307b7bc2f5b134e8e07221.
    https://bugs.launchpad.net/fuel/+bug/1669751 has been resolved.

    Change-Id: I009cf6cba8aaa7ff2ae625c5067aa4d1570e4793
    JIRA: FUEL-261
    Signed-off-by: Michael Polenchuk <mpolenchuk@mirantis.com>

diff --git a/docs/submodules/fuel b/docs/submodules/fuel
index 78c835c..44728c2 160000 (submodule)
--- a/docs/submodules/fuel
+++ b/docs/submodules/fuel
@@ -1 +1 @@
-Subproject commit 78c835c56466726e8c5a99942d5179714907b5f4
+Subproject commit 44728c2c0a75dafa6770d4bcfd2512ca3e2388c8