Update git submodules

* Update docs/submodules/fuel from branch 'master'
  - Merge "[baremetal] Retry keystone.client state on failure"
  - [baremetal] Retry keystone.client state on failure

    JIRA: FUEL-306

    Change-Id: I648545890c1f7dc59176beac1a0593aed54079cb
    Signed-off-by: Alexandru Avadanii <Alexandru.Avadanii@enea.com>
    Signed-off-by: Delia Popescu <delia.popescu@enea.com>

diff --git a/docs/submodules/fuel b/docs/submodules/fuel
index 637ab12..49021c0 160000 (submodule)
--- a/docs/submodules/fuel
+++ b/docs/submodules/fuel
@@ -1 +1 @@
-Subproject commit 637ab12768237d45a37f3c41716d36d3de53821d
+Subproject commit 49021c0d3853cf23690743fe3ff26d055ff3ee50