Update git submodules

* Update docs/submodules/releng from branch 'master'
  - Merge "Make the ovs_logger installer independent"
  - Make the ovs_logger installer independent

    The ovs_logger library was too tightly connected
    to the Fuel installer.
    This patch make the aforementioned library
    installer independent

    Change-Id: I39115067393b8d4baf66c23baf2d9c130e4668bd
    Signed-off-by: Dimitrios Markou <mardim@intracom-telecom.com>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index 4ba227e..c8ba060 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit 4ba227e8fcd2a5e20bb04ecf9cbc7779f8039f32
+Subproject commit c8ba060756ea33769b536d6ecef74a53c96db8fb