Update git submodules

* Update docs/submodules/fuel from branch 'master'
  - [virtual] Extend cinder volume size

    Rally test of NovaServers.boot_server_attach_created_volume_and_live_migrate
    requires 10Gb volume to function, so extend volume group size in order to
    avoid insufficient free space error.

    Change-Id: I317935d2bf736db360061e24f299c9b885154a9e
    Signed-off-by: Michael Polenchuk <mpolenchuk@mirantis.com>

diff --git a/docs/submodules/fuel b/docs/submodules/fuel
index 9ac845b..2d95dee 160000 (submodule)
--- a/docs/submodules/fuel
+++ b/docs/submodules/fuel
@@ -1 +1 @@
-Subproject commit 9ac845bdfb5c4ec7fd8c0b0ba1bc8fec867be5aa
+Subproject commit 2d95dee51177e66f5370b85115c2999925b13657