tests: pipe.t: increase proc:write() timeout to 300ms for stability and changed the ngx.say to ngx.log for the error logging since the test is running a timer. (openresty#326)

Author: xiaocang

t/pipe-stdin.t

@@ -463,13 +463,13 @@ local proc = ngx_pipe.spawn({"bash"})
 
 -- make writers blocked later
 local data = ("1234"):rep(2048)
-proc:set_timeouts(100)
+proc:set_timeouts(300)
 local total = 0
 local step = #data
 while true do
  local data, err = proc:write(data)
  if not data then
- ngx.say(err)
+ ngx.log(ngx.ERR, "proc write error: ", err)
  break
  end