Update git submodules

* Update docs/submodules/releng from branch 'master'
  - Merge "leverage testapi's own gitignore"
  - leverage testapi's own gitignore

    some files/dirs should be gitignored in testapi,
    but they may be needed in releng, this patch aims to
    manage gitignore by testapi itself

    Change-Id: I3c57d1199145d7f062d4e48aa8216ae34672f455
    Signed-off-by: SerenaFeng <feng.xiaowei@zte.com.cn>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index 6696c43..32e171f 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit 6696c4368b31a4ed033a13365e3d9f73845a5ab1
+Subproject commit 32e171f5ddc03491531a797770f7348fe4cc9b80