fix 2adcf59e

Try to fix issue:

https://github.com/agentzh/echo-nginx-module/issues/15

I've not tested much, but now I do not need to modify other modules test suites to make them pass.

Fix bug where outputted body too. Do not copy all that there is,
only to end of headers. Headers end at a end of line not at empty line.

Now echo -n $echo_client_request_headers;
Outputs:

"...
Last-Header: value\r\n"

Fix testsuite.