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Return buffered data on first EOF in tube.readline()

When there is still data available in the tube buffer when an EOFError occurs in
`tube.recvline()`, return that data even though it doesn't contain a newline.
The next time `tube.recvline()` is called afterwards will raise EOFError normally.

This behavior is in line with the GNU readline implementation and avoids
loss of data. It allows `tube.stream()` to print everything that's received before
the receiving end terminates.

A new warning is logged when data is returned due to an EOF informing
about the lack of the trailing newline character.

Fixes #2366

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