Update git submodules

* Update docs/submodules/fuel from branch 'master'
  - Merge "Fix barbican integration on compute nodes"
  - Fix barbican integration on compute nodes

    Locally overwriting barbican_integration_enable
    on compute nodes does not work.
    Set barbican_integration_enable to true by default.
    Disable barbican_integration at openstack_control side.
    While at it, enable barbican on ha scenarios too.

    JIRA: FUNCTEST-981

    Change-Id: I3c8df5d4078f73f32f3605dec5a7a365fa386019
    Signed-off-by: Delia Popescu <delia.popescu@enea.com>

diff --git a/docs/submodules/fuel b/docs/submodules/fuel
index 8de9c24..c2902b9 160000 (submodule)
--- a/docs/submodules/fuel
+++ b/docs/submodules/fuel
@@ -1 +1 @@
-Subproject commit 8de9c24300817b9d0ce4f2bfb2ab63643d895a1a
+Subproject commit c2902b924da9b2246ec80e7b541950b26ebc8cde