Migration compression parameters 'compress-level', 'compress-threads',
'decompress-threads' were deprecated by qemu. Drop them from the tests.
Note that the migration code automatically checks whether given
capability is supported by qemu and thus we don't need to add any
further code to prepare for the legacy compression to be dropped.
Signed-off-by: Peter Krempa <pkrempa@redhat.com>
Reviewed-by: Ján Tomko <jtomko@redhat.com>
