[SPARK-1875]NoClassDefFoundError: StringUtils when building with hadoop 1.x and hive

Author: witgo <witgo@qq.com>

Closes #824 from witgo/SPARK-1875_commons-lang-2.6 and squashes the following commits:

ef7231d [witgo] review commit
ead3c3b [witgo] SPARK-1875:NoClassDefFoundError: StringUtils when building against Hadoop 1

project/SparkBuild.scala

@@ -318,7 +318,6 @@ object SparkBuild extends Build {
   val excludeFastutil = ExclusionRule(organization = "it.unimi.dsi")
   val excludeJruby = ExclusionRule(organization = "org.jruby")
   val excludeThrift = ExclusionRule(organization = "org.apache.thrift")
-  val excludeCommonsLang = ExclusionRule(organization = "commons-lang")
   val excludeServletApi = ExclusionRule(organization = "javax.servlet", artifact = "servlet-api")
 
   def sparkPreviousArtifact(id: String, organization: String = "org.apache.spark",
@@ -493,7 +492,7 @@ object SparkBuild extends Build {
     javaOptions += "-XX:MaxPermSize=1g",
     libraryDependencies ++= Seq(
       "org.spark-project.hive" % "hive-metastore" % hiveVersion,
-      "org.spark-project.hive" % "hive-exec"      % hiveVersion excludeAll(excludeCommonsLang, excludeCommonsLogging),
+      "org.spark-project.hive" % "hive-exec"      % hiveVersion excludeAll(excludeCommonsLogging),
       "org.spark-project.hive" % "hive-serde"     % hiveVersion
     ),
     // Multiple queries rely on the TestHive singleton.  See comments there for more details.

sql/hive/pom.xml

@@ -57,10 +57,6 @@
           <groupId>commons-logging</groupId>
           <artifactId>commons-logging</artifactId>
         </exclusion>
-        <exclusion>
-          <groupId>commons-lang</groupId>
-          <artifactId>commons-lang</artifactId>
-        </exclusion>
       </exclusions>
     </dependency>
     <dependency>
@@ -80,10 +76,6 @@
           <groupId>commons-logging</groupId>
           <artifactId>commons-logging-api</artifactId>
         </exclusion>
-        <exclusion>
-          <groupId>commons-lang</groupId>
-          <artifactId>commons-lang</artifactId>
-        </exclusion>
       </exclusions>
     </dependency>
     <!-- hive-serde already depends on avro, but this brings in customized config of avro deps from parent -->