Add testcases for -c option of FSshell -tail ---------------------------------------------
Key: HDFS-2221
URL: https://issues.apache.org/jira/browse/HDFS-2221
Project: Hadoop HDFS
Issue Type: Test
Components: test
Affects Versions: 0.23.0
Reporter: XieXianshan
Fix For: 0.23.0
add testcases for HADOOP-7494.
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