better to have explicit httpclient dependency

Author: pjfanning

hadoop-hdfs-project/hadoop-hdfs-client/pom.xml

@@ -49,6 +49,14 @@ https://maven.apache.org/xsd/maven-4.0.0.xsd">
         </exclusion>
       </exclusions>
     </dependency>
+    <dependency>
+      <groupId>org.apache.httpcomponents</groupId>
+      <artifactId>httpclient</artifactId>
+    </dependency>
+    <dependency>
+      <groupId>org.apache.httpcomponents</groupId>
+      <artifactId>httpcore</artifactId>
+    </dependency>
     <dependency>
       <groupId>junit</groupId>
       <artifactId>junit</artifactId>