Add testcases for -n option of FSshell -tail ---------------------------------------------
Key: HDFS-2279
URL: https://issues.apache.org/jira/browse/HDFS-2279
Project: Hadoop HDFS
Issue Type: Test
Components: test
Affects Versions: 0.23.0
Reporter: XieXianshan
Priority: Trivial
Fix For: 0.23.0
Add a few test cases for HADOOP-7546.
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