[HBASE-23878] Backport HBASE-22040 to branch-2.1 - ASF JIRA

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Release Note:

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Add a mergeRegionsAsync(byte[][], boolean) method in the AsyncAdmin interface.

Instead of using assert, now we will throw IllegalArgumentException when you want to merge less than 2 regions at client side. And also, at master side, instead of using assert, now we will throw DoNotRetryIOException if you want merge more than 2 regions, since we only support merging two regions at once for now.

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Add a mergeRegionsAsync(byte[][], boolean) method in the AsyncAdmin interface. Instead of using assert, now we will throw IllegalArgumentException when you want to merge less than 2 regions at client side. And also, at master side, instead of using assert, now we will throw DoNotRetryIOException if you want merge more than 2 regions, since we only support merging two regions at once for now.