Update git submodules

* Update docs/submodules/fuel from branch 'master'
  - Update reclass system model

    Get the latest reclass system model to be in sync with salt
    formulas code. Adjust keystone v3 admin endpoint patch.

    Change-Id: Ia7ce6187b875cc9e18af2784ef1eb5df1c145c7d
    Signed-off-by: Michael Polenchuk <mpolenchuk@mirantis.com>

diff --git a/docs/submodules/fuel b/docs/submodules/fuel
index 5532af2..8621846 160000 (submodule)
--- a/docs/submodules/fuel
+++ b/docs/submodules/fuel
@@ -1 +1 @@
-Subproject commit 5532af2b423237474b7667250c81ada255426898
+Subproject commit 8621846f46b63ac6b2276cbb105331ae0a34dec8