iotests: Drop format-specific in _filter_img_info
_filter_img_info should remove format-specific information, too. We already have such a filter in _img_info, and it is very useful for query-block-named-block-nodes (etc.), too. However, in 198 we need that information (but we still want the rest of the filter), so make that filtering optional. Note that "the rest of the filter" includes filtering of the test directory, so we can drop the _filter_testdir from 198 at the same time. Signed-off-by: NMax Reitz <mreitz@redhat.com> Message-id: 20171123020832.8165-7-mreitz@redhat.com Reviewed-by: NEric Blake <eblake@redhat.com> Reviewed-by: NFam Zheng <famz@redhat.com> Signed-off-by: NMax Reitz <mreitz@redhat.com>
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