Update git submodules

* Update docs/submodules/fuel from branch 'stable/fraser'
  - Run galera state on slave nodes one by one

    Apply galera state in consecutive order to avoid
    a race condition with database initialization.

    Change-Id: I877bad38777d8469c03cee3b7e96acc875a3a72a
    Signed-off-by: Michael Polenchuk <mpolenchuk@mirantis.com>
    (cherry picked from commit 3bc1605a823400a80965f56ed9a502a8ce67b883)

diff --git a/docs/submodules/fuel b/docs/submodules/fuel
index cfba3e9..5ccfb79 160000 (submodule)
--- a/docs/submodules/fuel
+++ b/docs/submodules/fuel
@@ -1 +1 @@
-Subproject commit cfba3e9da448ebf47b7cea77d3335277d9b3c96b
+Subproject commit 5ccfb79098c726477e9a07dad2a57e0693bf6ba6