Read the proxy info from testcase, and set it to hosts when dhrystone benchmarks...

Read the proxy info from testcase, and set it to hosts when dhrystone benchmarks test.

modification:
  Write the git_proxy_pbook.yaml to set git proxy info in hosts or vms.
  Write the sys_proxy_pbook.yaml to set yum apt wget env proxy info in hosts or vms.
  Change the dhrystone.yaml to include proxy  and add the zte-pod1 /compute/dhrystone_bm.yaml.Tested and passed.Other playbooks did not include the proxy yet. I will test and push lately.

QTIP-74

Change-Id: Ia820bc32798b9f1f6f4165a111524e04c129a5df
Signed-off-by: zhifeng.jiang <jiang.zhifeng@zte.com.cn>