Region interface cleanup for CP expose

Below methods are removed from CP exposed Region interface getOpenSeqNum getOldestSeqIdOfStore isLoadingCfsOnDemandDefault getReadpoint updateReadRequestsCount updateWriteRequestsCount getRegionServicesForStores getMetrics getHDFSBlocksDistribution releaseRowLocks batchReplay get(Get get, boolean withCoprocessor, long nonceGroup, long nonce) bulkLoadHFiles execService registerService checkFamilies checkTimestamps prepareDelete prepareDeleteTimestamps updateCellTimestamps flush compact waitForFlushesAndCompactions waitForFlushes Change signature of below methods by dropping params 'nonceGroup', 'nonce' append(Append append, long nonceGroup, long nonce) batchMutate(Mutation[] mutations, long nonceGroup, long nonce) increment(Increment increment, long nonceGroup, long nonce)