common/iobuf.c: Buffered data should not be processed by new filters.
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common/iobuf.c: Buffered data should not be processed by new filters.

* common/iobuf.c (iobuf_push_filter2): If the pipeline is an output or
temp pipeline, the new filter shouldn't assume ownership of the old
head's internal buffer: the data was written before the filter was
added.
* common/t-iobuf.c (double_filter): New function.
(main): Add test cases for the above bug.