ArrayIndexOutOfBoundsException thrown from RotateServerByNameJobShardingStrategy

[emac]

线上环境使用时，发现某些采用RotateServerByNameJobShardingStrategy分片策略的job会抛出ArrayIndexOutOfBoundsException异常。原因是因为RotateServerByNameJobShardingStrategy Line-26调用jobName.hashcode()时可能返回负值，导致数组越界。

org.quartz.SchedulerException: Job threw an unhandled exception.
at org.quartz.core.JobRunShell.run(JobRunShell.java:213) ~[org.quartz-scheduler.quartz-2.2.1.jar:na]
at org.quartz.simpl.SimpleThreadPool$WorkerThread.run(SimpleThreadPool.java:573) [org.quartz-scheduler.quartz-2.2.1.jar:na]
Caused by: java.lang.ArrayIndexOutOfBoundsException: -1
at java.util.ArrayList.elementData(ArrayList.java:418) ~[na:1.8.0_60]
at java.util.ArrayList.get(ArrayList.java:431) ~[na:1.8.0_60]
at com.dangdang.ddframe.job.plugin.sharding.strategy.RotateServerByNameJobShardingStrategy.rotateServerList(RotateServerByNameJobShardingStrategy.java:33) ~[com.dangdang.elastic-job-core-1.0.2.jar:na]
at com.dangdang.ddframe.job.plugin.sharding.strategy.RotateServerByNameJobShardingStrategy.sharding(RotateServerByNameJobShardingStrategy.java:21) ~[com.dangdang.elastic-job-core-1.0.2.jar:na]
at com.dangdang.ddframe.job.internal.sharding.ShardingService.shardingIfNecessary(ShardingService.java:107) ~[com.dangdang.elastic-job-core-1.0.2.jar:na]
at com.dangdang.ddframe.job.internal.job.AbstractElasticJob.execute(AbstractElasticJob.java:73) ~[com.dangdang.elastic-job-core-1.0.2.jar:na]
at org.quartz.core.JobRunShell.run(JobRunShell.java:202) ~[org.quartz-scheduler.quartz-2.2.1.jar:na]

[terrymanu]

已merge