Bump hadoop-client from 2.2.0 to 2.7.0 in /spark-2.1.1#21

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dependabot/maven/spark-2.1.1/org.apache.hadoop-hadoop-client-2.7.0shiwendai/SparkSourceCodeLearning:dependabot/maven/spark-2.1.1/org.apache.hadoop-hadoop-client-2.7.0Copy head branch name to clipboard