ReadCommitted does not work in distributed mode

ReadCommitted isolation level doesn't work as expected in distributed mode:

• tx1@Node1 reads (k1,v1) which is owned by Node2. At this point it keeps a cached copy of the entry locally
• tx2@Node3 writes (k1,v2) and commits
• tx1@Node1 reads k1 again and it gets the value "v1" - wrong!