HADOOP-13696. change hadoop-common dependency scope of jsch to provided. Contributed by Yuanbo Liu.

hadoop-common-project/hadoop-common/pom.xml

@@ -235,6 +235,7 @@
     <dependency>
       <groupId>com.jcraft</groupId>
       <artifactId>jsch</artifactId>
+      <scope>provided</scope>
     </dependency>
     <dependency>
       <groupId>org.apache.curator</groupId>