Update git submodules

* Update docs/submodules/fuel from branch 'master'
  - [patch] Use keystone v3 endpoints by default

    Change-Id: I98fc378fbec3679acf5bad4c089972340daea92c
    Signed-off-by: Michael Polenchuk <mpolenchuk@mirantis.com>

diff --git a/docs/submodules/fuel b/docs/submodules/fuel
index e016aec..2b62cfb 160000 (submodule)
--- a/docs/submodules/fuel
+++ b/docs/submodules/fuel
@@ -1 +1 @@
-Subproject commit e016aec95fb278ae02f0ac96814182dd6a2f50cd
+Subproject commit 2b62cfb434b720d869f81c9f66e20fa0c8dc2daa