Refactor dhrystone playbook

Refactor dhrystone playbook

- Break previous one playbook into three playbooks:
    setup.yaml: setup test environment.
    run.yaml: execute test steps
    clean.yaml: cleanup test environment to restore
    environment
  The advantage is cleaning part will never be blocked by another.
- Just do testing on remote hosts, parse logfile on localhost.
- Use ansible module instead of shell command.
- Move up all files under /ansible and remove ansible directory.
  Under /ansible, ansible package cann't be imported.

Change-Id: I43c65be23869b7d42ca769994d4decb9a012d196
Signed-off-by: wu.zhihui <wu.zhihui1@zte.com.cn>