Add /request endpoint in test_server.bin

Add new endpoint in test_server application:
- /request prints the client request (method, URL, HTTP version and
  headers) in the payload of the reply
  /request can take a "response_code" parameter (ie,
  "/request?response_code=404"), the server replies with the appropriate
  HTTP response code to the client.

Change-Id: Ibc03f62da06a5bbb93959eac865e5f3f14caa50e
1 file changed