Move flushing 'output' list into separate function

'output' is a list of messages that pacman received but delayed printing
to avoid messing with UI.

Such functionality is useful for the upcoming multi-line progress bar
UI. Let's move it to a separate function.

Signed-off-by: Anatol Pomozov <anatol.pomozov@gmail.com>
Signed-off-by: Allan McRae <allan@archlinux.org>

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