Next:Test for resource and link in the test_http_json_SUITE

I just test two groups-- test_resource and test_link.
The problems:
1. put_resource and put_link:
   We got the codeHTTP=200, but it should be 409.
2. get_resource and get_link:
    We can't find the information with "application/json", it's "text/plain",but it should be "application/json".
3. post_link_new:
   We got the codeHTTP=500, but it should be 200.