This feature can help to reduce the data transferred about 60%, and the migration time can also be reduced about 70%.
Summary of changed from v1->v2
-Changed the decompression thread limit from 64 to 255
-Fixed some spelling mistake
-Added test result to the document
-Fixed the version mistake in qapi-schema.json
-Added the document of the 'compress' flag
-Rebased the series to proposed the document first
-Fixed comment
--
1.9.1
