Update git submodules

* Update docs/submodules/fuel from branch 'stable/euphrates'
  - Connect proxy nodes to public network

    cloudify vnf requires public enpoints to be available from instance
    with manager, so connect nodes w/ nginx to routed public network.

    JIRA: FUEL-286
    Change-Id: Id0caa699519b9b46dad51deac6955afe6a0050de
    Signed-off-by: Michael Polenchuk <mpolenchuk@mirantis.com>
    (cherry picked from commit 0861ea0799114d9c59499f2c52a9c7a79fb1bbb7)

diff --git a/docs/submodules/fuel b/docs/submodules/fuel
index 4573740..fd2100b 160000 (submodule)
--- a/docs/submodules/fuel
+++ b/docs/submodules/fuel
@@ -1 +1 @@
-Subproject commit 45737405947d6b0a66f777a3b8460fc7e8cc4cdd
+Subproject commit fd2100b6ec4685374b7704bc67f3a079e6bce57c