fix a bug in filter's propagated_params passing.
fix a bug in filter's propagated_params passing.

In previous version, a propagated_params table was bound to a url path, and it keeps that table in the
scope of the same path request. Now fix it.

But, this prompt us that we can use this feature to store status between different but the same path request.

Signed-off-by: Daogang Tang <6435653d2db08e7863743a16df53ecbb301fb4b0@gmail.com>

daogangtang/bamboo,daogangtang/bamboo