build: allow builds from stdin for multi-node builders #2656
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fixes #2193
When building from same stream all nodes need to read data from the same stream. In order to achive that there is a new SyncMultiReader wrapper that sends the stream concurrently to all readers. Readers must read at similar speed or pauses will happen while they wait for each other.
Dockerfiles were already written to disk before sent. Now the file written by the first node is reused for others.