Update git submodules

* Update docs/submodules/releng from branch 'master'
  - Merge "fix the log name of functest result for doctor project"
  - fix the log name of functest result for doctor project

    Change-Id: I356036cad510e4fe5550505d46dbf1aea3b11496
    Signed-off-by: dongwenjuan <dong.wenjuan@zte.com.cn>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index 4611684..21cf4e0 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit 4611684d6277edc84f7633c336d5b2e959053814
+Subproject commit 21cf4e0dc660703ba5af6d4c5fd49b12b8c363d3