[SPARK-12972][CORE] update httpclient to 4.5.1

Author: blbradley

pom.xml

@@ -158,7 +158,7 @@
     <!-- the producer is used in tests -->
     <aws.kinesis.producer.version>0.10.2</aws.kinesis.producer.version>
     <!--  org.apache.httpcomponents/httpclient-->
-    <commons.httpclient.version>4.3.2</commons.httpclient.version>
+    <commons.httpclient.version>4.5.1</commons.httpclient.version>
     <!--  commons-httpclient/commons-httpclient-->
     <httpclient.classic.version>3.1</httpclient.classic.version>
     <commons.math3.version>3.4.1</commons.math3.version>
@@ -416,11 +416,6 @@
         <artifactId>httpclient</artifactId>
         <version>${commons.httpclient.version}</version>
       </dependency>
-      <dependency>
-        <groupId>org.apache.httpcomponents</groupId>
-        <artifactId>httpcore</artifactId>
-        <version>${commons.httpclient.version}</version>
-      </dependency>
       <dependency>
         <groupId>org.seleniumhq.selenium</groupId>
         <artifactId>selenium-java</artifactId>