Update git submodules

* Update docs/submodules/fuel from branch 'master'
  - [virtual] Horizon: server: secure = False

    Horizon login fails due to CSRF_COOKIE_SECURE being set when no SSL
    is available.

    JIRA: FUEL-297

    Change-Id: I23f8ee86dbf5a909c75cfcc217a2ab6e4dca7324
    Signed-off-by: Alexandru Avadanii <Alexandru.Avadanii@enea.com>

diff --git a/docs/submodules/fuel b/docs/submodules/fuel
index b93f6c9..6436cba 160000 (submodule)
--- a/docs/submodules/fuel
+++ b/docs/submodules/fuel
@@ -1 +1 @@
-Subproject commit b93f6c997d9e5c174a1ddaec1c73dedfcdf7c106
+Subproject commit 6436cbad3cdf190d891c0121c7e6a7fd814a1026