bugfix: TestAPI auto deploy success but shown as fail

when execute 'curl -s --head  --request GET http://testresults.opnfv.org/test'
'HTTP/1.1 301 Moved Permanently' will be returned rather than 200 OK,
result in the connectivity check fail. To fix this problem,
use 'http://testresults.opnfv.org/test/' instead.

Change-Id: I5d6916c15858b3f431a2ab18aeef7f352cb9e31b
Signed-off-by: SerenaFeng <feng.xiaowei@zte.com.cn>