Update git submodules

* Update docs/submodules/fuel from branch 'stable/euphrates'
  - Merge "[baremetal] Retry cinder.controller on failure" into stable/euphrates
  - [baremetal] Retry cinder.controller on failure

    Occasionally, cinderng.volume_type_present errors with:
    ClientException: Service Unavailable (HTTP 503)
    Instead of retrying the whole state file, use `wait_for` macro
    to retry only this high state up to 5 times.

    Change-Id: Ib9ef017aca737e53c853007c13107d56d856c016
    Signed-off-by: Alexandru Avadanii <Alexandru.Avadanii@enea.com>
    (cherry picked from commit 92fb2b5e303b5e097a21d43612d5c8132f23152b)

diff --git a/docs/submodules/fuel b/docs/submodules/fuel
index 03fd6c2..115c12a 160000 (submodule)
--- a/docs/submodules/fuel
+++ b/docs/submodules/fuel
@@ -1 +1 @@
-Subproject commit 03fd6c28b0fcc522816da8d59acfb53e07006307
+Subproject commit 115c12a0546fb6e9db44cf2697a3acf3ea9955e0