Update git submodules

* Update docs/submodules/releng from branch 'master'
  - Merge "Add pod description file support"
  - Add pod description file support

    JIRA: BOTTLENECK-178

    Need to add pod descrition file for Bottlenecks to be installer-agnostic

    Change-Id: I100022ff1fcdaabe800492649c138dfe9fce55c2
    Signed-off-by: Yang (Gabriel) Yu <Gabriel.yuyang@huawei.com>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index 1e5d0a8..c839d60 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit 1e5d0a8a7b71e964940a63175c3495402312b896
+Subproject commit c839d60298dcc73233a16a36ffc00c1bcbcee6b4