samba-tool domain provision: Fix --interactive module in python3

Andrew Bartlettrequested to merge
samba-team/devel/samba:abartlet-fix-provision-py3-flush into master

The prompts were not being printed to the screen because the stream was not being flushed.

BUG: https://bugzilla.samba.org/show_bug.cgi?id=13828

Signed-off-by: Andrew Bartlett abartlet@samba.org

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