Update git submodules

* Update docs/submodules/fuel from branch 'master'
  - Merge "Bring in Barbican service onboard"
  - Bring in Barbican service onboard

    Change-Id: I68759360c9dd8f8cf422161e21ed15df6c694e84
    Signed-off-by: Michael Polenchuk <mpolenchuk@mirantis.com>

diff --git a/docs/submodules/fuel b/docs/submodules/fuel
index 8ac1c0f..e0ee4b0 160000 (submodule)
--- a/docs/submodules/fuel
+++ b/docs/submodules/fuel
@@ -1 +1 @@
-Subproject commit 8ac1c0fa491ab5de2eaf128374f9c73202df1751
+Subproject commit e0ee4b03e2eca114d6c2a852022df1776cd5b6a4