Make adjustments to combocid test so that it passes

SAVEPOINTs were used, which we don't support. So commented those out (along
with ROLLBACK calls). That does have an impact on the test case though because
at least in one place we were checking if the cmin goes back to 0 after rolling
back to a savepoint. But there is not much we can do about that until we add
SAVEPOINT support. Other changes include accepting diffs because of ctid
changes as rows come from different nodes and hence ctids are
duplicated/changed.

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