Update git submodules

* Update docs/submodules/fuel from branch 'stable/euphrates'
  - Run aodh state one by one

    Apply aodh state in consecutive order to avoid
    a race condition with database synchronization.

    Change-Id: I4684fbeaaba2c9780084e0a64fe6453bccfb67e0
    Signed-off-by: Michael Polenchuk <mpolenchuk@mirantis.com>
    (cherry picked from commit 9cfa75272ba2fd9abab416db1f22df5989c9959e)

diff --git a/docs/submodules/fuel b/docs/submodules/fuel
index a649315..c75ba4b 160000 (submodule)
--- a/docs/submodules/fuel
+++ b/docs/submodules/fuel
@@ -1 +1 @@
-Subproject commit a64931567c37a2fa551ca21e8382259a3c4814c7
+Subproject commit c75ba4b14bf2b5f2b21ebc8705e2e4e60746f960