Optimize the order of slots in ProcessorSlot SPI config (alibaba#1649)

Author: JiangZian

sentinel-core/src/main/resources/META-INF/services/com.alibaba.csp.sentinel.slotchain.ProcessorSlot

@@ -3,8 +3,8 @@ com.alibaba.csp.sentinel.slots.nodeselector.NodeSelectorSlot
 com.alibaba.csp.sentinel.slots.clusterbuilder.ClusterBuilderSlot
 com.alibaba.csp.sentinel.slots.logger.LogSlot
 com.alibaba.csp.sentinel.slots.statistic.StatisticSlot
-com.alibaba.csp.sentinel.slots.system.SystemSlot
 com.alibaba.csp.sentinel.slots.block.authority.AuthoritySlot
+com.alibaba.csp.sentinel.slots.system.SystemSlot
 com.alibaba.csp.sentinel.slots.block.flow.FlowSlot
 com.alibaba.csp.sentinel.slots.block.qlearning.QLearningSlot
 com.alibaba.csp.sentinel.slots.block.degrade.DegradeSlot