simple-stream: simple_memory_input_stream shouldn't need Iterator
simple-stream: simple_memory_input_stream shouldn't need Iterator

Memory input and output streams that work with fragmented buffers
accept iterator that point to the fragments of the underlying buffer.
It makes little sense for simple_memory_input_stream to excpect a type
such iterator as it works exclusively with contiguous buffers.

dreamsxin/seastar,cloudius-systems/seastar,avikivity/seastar,scylladb/seastar,dreamsxin/seastar,cloudius-systems/seastar,avikivity/seastar,syuu1228/seastar,syuu1228/seastar,cloudius-systems/seastar,scylladb/seastar,syuu1228/seastar,dreamsxin/seastar,scylladb/seastar,avikivity/seastar