Update git submodules

* Update docs/submodules/fuel from branch 'stable/fraser'
  - [patch] Backport proposed generate_dhparams fix

    Upstream PR [1] should fix recently introduced issues with nginx
    state for SSL-enabled sites.

    [1] https://github.com/salt-formulas/salt-formula-nginx/pull/40

    Change-Id: I52b5e4f51539e535249e0850f0b34c2801f4d74a
    Signed-off-by: Alexandru Avadanii <Alexandru.Avadanii@enea.com>
    (cherry picked from commit c7dff6e1ae6444f60d3fe20b1f495609c7980051)

diff --git a/docs/submodules/fuel b/docs/submodules/fuel
index c8babe3..fb78f20 160000 (submodule)
--- a/docs/submodules/fuel
+++ b/docs/submodules/fuel
@@ -1 +1 @@
-Subproject commit c8babe3e64c1c958c4ef0f6573edf9a08e1726eb
+Subproject commit fb78f2057df57af51a257c4605ff28cbec97cc79