fix-zero-chunk-end-of-request: fix test input

The bug was written into the test input. Final chunks did not have a final \r\n which was causing the tests to fail now that the bug is fixed.

lib_test/test_server_connection.ml

@@ -413,7 +413,7 @@ let test_echo_post () =
   write_response t
     ~body:"e\r\nThis is a test\r\n"
     response;
-  read_string  t "\r\n0\r\n";
+  read_string  t "\r\n0\r\n\r\n";
   write_string t "0\r\n\r\n";
   writer_yielded t;
 
@@ -427,7 +427,7 @@ let test_echo_post () =
     response;
   read_string  t "\r\n21\r\n... that involves multiple chunks";
   write_string t "21\r\n... that involves multiple chunks\r\n";
-  read_string  t "\r\n0\r\n";
+  read_string  t "\r\n0\r\n\r\n";
   write_string t "0\r\n\r\n";
   writer_yielded t;
 
@@ -442,7 +442,7 @@ let test_echo_post () =
     ~body:"This is a test"
     response;
   read_string  t "\r\n21\r\n... that involves multiple chunks";
-  read_string  t "\r\n0\r\n";
+  read_string  t "\r\n0\r\n\r\n";
   write_string t "... that involves multiple chunks";
   connection_is_shutdown t;
 ;;