Update git submodules

* Update docs/submodules/fuel from branch 'master'
  - Merge "Set ntp servers list"
  - Set ntp servers list

    * set ntp sweden servers list for virtuals
    * wrap common cluster init options

    Change-Id: I044802998d5498fed969e62bf1ea8c814652f34f
    Signed-off-by: Michael Polenchuk <mpolenchuk@mirantis.com>

diff --git a/docs/submodules/fuel b/docs/submodules/fuel
index fffbe2c..447ba63 160000 (submodule)
--- a/docs/submodules/fuel
+++ b/docs/submodules/fuel
@@ -1 +1 @@
-Subproject commit fffbe2cb567a5e367dbee7ce059050fde6372110
+Subproject commit 447ba637bd160ef709f4cf65e7e765914eda83ca