Update git submodules

Update git submodules

* Update docs/submodules/daisy from branch 'master'
  - Merge "Convert the bash commands in post.sh to python code"
  - Convert the bash commands in post.sh to python code

    According to the comment from Serena in the patch
    https://gerrit.opnfv.org/gerrit/#/c/37857/, the bash code
    in post.sh can be implemented by python, and the deploy
    script can call post/execute.py directly.

    Change-Id: Ibcf86fc2b6ee3942e4082384c9d4075d608b7294
    Signed-off-by: Alex Yang <yangyang1@zte.com.cn>