Update git submodules

Update git submodules

* Update docs/submodules/daisy from branch 'master'
  - Merge "Add some unittest files such as test_nova.py"
  - Add some unittest files such as test_nova.py

    1.Add test_glance.py, test_neutron.py and test_nova.py unittest
    files, and modify the neutron.py to adapt the unittest.
    2.Add some unittest functions in test_post_execute.py,
    test_deploy.py, test_keystoneauth.py.
    3.rename test_prepare_execure.py to test_prepare_execute.py.

    Change-Id: Ie0640d133e27c558648416a6a5cf044a00ffa67f
    Signed-off-by: zhongjun <zhong.jun@zte.com.cn>