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Description of problem: mixed pool is blocked in code, preventing us from attaching old version (0) to newer pool (2). commit was entered in hash: 017db3b2 need to revert it wisely, meaning: attachStorageDomain should check if domain is data-domain and version, if version == '0', vdsm should invoke domainUpgrade() for that domain, and we should make it transitent as possible, meaning, attachStorageDomain command should not return till upgradeDomain() is done.
Closing old bugs. If this issue is still relevant/important in current version, please re-open the bug.