Fix a few javac warnings under packages fs and util
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Key: HADOOP-5842
URL: https://issues.apache.org/jira/browse/HADOOP-5842
Project: Hadoop Core
Issue Type: Bug
Reporter: Hairong Kuang
Assignee: Hairong Kuang
Fix For: 0.21.0
Fix javac warnings in the following files:
fs/FileSystem.java
fs/ChecksumException.java
fs/FSError.java
fs/kfs/KFSInputStream.java
fs/s3/S3FileSystemException.java
fs/s3/S3Exception.java
fs/s3/VersionMismatchException.java
util/ProcfsBasedProcessTree.java
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