iotests: Simplify _filter_img_create() a bit
Not only is it a bit stupid to try to filter multi-line "Formatting" output (because we only need it for a single test, which can easily be amended to no longer need it), it is also problematic when there can be output after a "Formatting" line that we do not want to filter as if it were part of it. So rename _filter_img_create to _do_filter_img_create, let it filter only a single line, and let _filter_img_create loop over all input lines, calling _do_filter_img_create only on those that match /^Formatting/ (basically, what _filter_img_create_in_qmp did already). (And fix 020 to work with that.) Reported-by: NKevin Wolf <kwolf@redhat.com> Signed-off-by: NMax Reitz <mreitz@redhat.com> Message-Id: <20200709110205.310942-1-mreitz@redhat.com> Signed-off-by: NKevin Wolf <kwolf@redhat.com>
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