HADOOP-13661. Upgrade HTrace version. Contributed by Sean Mackrory.

hadoop-common-project/hadoop-common/src/site/markdown/Tracing.md

@@ -48,7 +48,7 @@ LocalFileSpanReceiver is included in the htrace-core4 jar which is bundled
 with Hadoop.)
 
 ```
-    $ cp htrace-htraced/target/htrace-htraced-4.0.1-incubating.jar $HADOOP_HOME/share/hadoop/common/lib/
+    $ cp htrace-htraced/target/htrace-htraced-4.1.0-incubating.jar $HADOOP_HOME/share/hadoop/common/lib/
 ```
 
 ### Dynamic update of tracing configuration

hadoop-project/pom.xml

@@ -882,7 +882,7 @@
       <dependency>
         <groupId>org.apache.htrace</groupId>
         <artifactId>htrace-core4</artifactId>
-        <version>4.0.1-incubating</version>
+        <version>4.1.0-incubating</version>
       </dependency>
       <dependency>
         <groupId>org.jdom</groupId>