[Hadoop Wiki] Update of "HowToSetupYourDevelopmentEnvironment" by LarsFrancke

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The "HowToSetupYourDevelopmentEnvironment" page has been changed by LarsFrancke:
https://wiki.apache.org/hadoop/HowToSetupYourDevelopmentEnvironment?action=diff&rev1=33&rev2=34

Comment:
Fix part of the setup for YARN (still doesn't work)

  {{{
  export HADOOP_COMMON_HOME=$(pwd)/$(ls -d hadoop-common-project/hadoop-common/target/hadoop-common-*-SNAPSHOT)
  export HADOOP_HDFS_HOME=$(pwd)/$(ls -d hadoop-hdfs-project/hadoop-hdfs/target/hadoop-hdfs-*-SNAPSHOT)
- export HADOOP_MAPRED_HOME=$(pwd)/$(ls -d hadoop-mapreduce-project/target/hadoop-mapreduce-*-SNAPSHOT)
+ export HADOOP_MAPRED_HOME=$(pwd)/$(ls -d hadoop-yarn-project/target/hadoop-yarn-*-SNAPSHOT)
- export YARN_HOME=$HADOOP_MAPRED_HOME
+ export HADOOP_YARN_HOME=$HADOOP_MAPRED_HOME
  export PATH=$HADOOP_COMMON_HOME/bin:$HADOOP_HDFS_HOME/bin:$HADOOP_MAPRED_HOME/bin:$PATH
  }}}
  
  Configure YARN to start a MR shuffle service:
  
  {{{
- cat > $YARN_HOME/conf/yarn-site.xml  << EOF
+ cat > $HADOOP_YARN_HOME/conf/yarn-site.xml  << EOF
  <?xml version="1.0"?>
  <configuration>
      <!-- Site specific YARN configuration properties -->