Update git submodules

Update git submodules

* Update docs/submodules/daisy from branch 'master'
  - Merge "Add the pytest files for post py files"
  - Add the pytest files for post py files

    1.add the test_keystoneauth.py and test_post_execute.py
    2.modify the test-requirements.txt to update the dependent
    python package.

    Change-Id: I0957c723bd82faa9060c7d5ae021d46feaed05ae
    Signed-off-by: zhongjun <zhong.jun@zte.com.cn>