Update git submodules

* Update docs/submodules/releng from branch 'master'
  - Merge "bugfix for the jnlpUrl"
  - bugfix for the jnlpUrl

    It always report 404 Not Found to get agent.jnlp from master

    Change-Id: I48d27f04c38ed92ff39ef423ed0d1fc6ca5ff2cd
    Signed-off-by: dongwenjuan <dongwenjuan1122@gmail.com>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index 2fd97d3..668072f 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit 2fd97d37b777985c53c0a1b6e73bf80d7158bf8d
+Subproject commit 668072f6a6f76381f7babc9950e99e935db1b6ed