UPDATE 2-RBS Irish unit fined $2.5 mln over capital rules

* Liquidity, capital rules violations took place in 2011 * Customers not affected, CBank says considers matter closed * Latest in series of regulatory problems at nationalisedlender DUBLIN, Nov 19 (Reuters) - The Irish Central Bank has finedRoyal Bank of Scotland's Irish unit 2 million euros($2.5 million) for violating liquidity and capital rules, in thelatest regulatory blow to the nationalised