Update git submodules

* Update docs/submodules/releng from branch 'master'
  - Move the defaut openstack to ocata

    Moving from newton to Ocata openstack for deployment by default.
    This patch will fix the aboe description.

    Change-Id: I088dfab923589d50305c8e23356eaf2abe0a062f
    Signed-off-by: Narinder Gupta <narinder.gupta@canonical.com>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index 093fa0c..0ef1d34 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit 093fa0c3bdc39eb1bbc449534e8824411afec428
+Subproject commit 0ef1d346a7347fc6d9ae0b9f9036a4c3ac4fc8c9