GMU bugfix: ordering in the commit queue does not trigger the check for ready transactions
GMU: added a test case for a previous bugfix
GMU: added test case for consistency check when a node is a read-only participant in a transaction
GMU: bugfix: wrong synchronization can allow two or more transactions to commit at the same time (violating the order in CommitLog)
bugfix gmu: cache topology can be delivered by any order
rebase fix