Update git submodules

* Update docs/submodules/releng from branch 'master'
  - Merge "Update the fuel ci job on zte pods"
  - Update the fuel ci job on zte pods

    - Delete Danube job on zte-pod1
    - Modify the triggers on zte-pod1
    - Delete master and Euphrates job on zte-pod3

    Change-Id: I034dc3b968ee9255aa014c28dc08237fc0803d32
    Signed-off-by: zhihui wu <wu.zhihui1@zte.com.cn>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index 174e24e..d7904f6 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit 174e24e31c9b15b4b9d29656e261d38ac96f69a0
+Subproject commit d7904f63223f10c356c9d2154ddc1827dd4f2982