Update git submodules

* Update docs/submodules/releng from branch 'master'
  - Merge "leverage setup.py directly to install TestAPI"
  - leverage setup.py directly to install TestAPI

    1. delete additional script install.sh
    2. using 'python setup.py install' directly to install
    TestAPI, as traditional python project do

    Change-Id: Ifcdee7b2bae2553f523a722bff794c40d20f81cc
    Signed-off-by: SerenaFeng <feng.xiaowei@zte.com.cn>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index 8c9c964..c83ab03 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit 8c9c9640b1dddda0c228eaf5caf7855ed01fc967
+Subproject commit c83ab03b1b81623a8bedb9763b32de01ec492233