set operationNames's cache capacity to 10000

[jukylin]

func NewOperationNamesStorage(
	session cassandra.Session,
	writeCacheTTL time.Duration,
	metricsFactory metrics.Factory,
	logger *zap.Logger,
) *OperationNamesStorage {
	return &OperationNamesStorage{
		session:       session,
		InsertStmt:    insertOperationName,
		QueryStmt:     queryOperationNames,
		metrics:       casMetrics.NewTable(metricsFactory, "OperationNames"),
		writeCacheTTL: writeCacheTTL,
		logger:        logger,
		operationNames: cache.NewLRUWithOptions(
			100000,
			&cache.Options{
				TTL:             writeCacheTTL,
				InitialCapacity: 0000,
			}),
	}
}

InitialCapacity should be 10000, not 0000. Right?
#619