iotests: Make _filter_nbd drop log lines
The NBD log lines ("/your/source/dir/nbd/xyz.c:function():line: error") should not be converted to empty lines but removed altogether. Signed-off-by: NMax Reitz <mreitz@redhat.com> Reviewed-by: NEric Blake <eblake@redhat.com> Signed-off-by: NKevin Wolf <kwolf@redhat.com>
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