increase unittest timeouts to decrease travis false positive failures

Author: dangra

scrapy/tests/test_commands.py

@@ -41,7 +41,7 @@ def proc(self, *new_args, **kwargs):
         while p.poll() is None:
             sleep(interval)
             waited += interval
-            if waited > 5:
+            if waited > 15:
                 p.kill()
                 assert False, 'Command took too much time to complete'