Improve some block recovery log messages
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Key: HDFS-3220
URL: https://issues.apache.org/jira/browse/HDFS-3220
Project: Hadoop HDFS
Issue Type: Improvement
Reporter: Eli Collins
FsDatasetImpl has three cases that throw exceptions with the message "THIS IS
NOT SUPPOSED TO HAPPEN". These could happen in real life (eg with a corrupt
block file). Let's improve these messages to indicate what case we've actually
hit instead of this message, which isn't very useful.
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