[Tajo Wiki] Update of "UnitTests" by HyunsikChoi

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The "UnitTests" page has been changed by HyunsikChoi:
https://wiki.apache.org/tajo/UnitTests?action=diff&rev1=1&rev2=2

  $ mvn clean install
  }}}
  
- If you want to perform the unit tests with the on-demand mode. you should give a JVM option to maven as follows:
+ If you want to perform the unit tests with the on-demand mode using Yarn as a cluster resource manager. you should give a JVM option to maven as follows:
  
  {{{
- mvn clean install -Dtajo.resource.manager=org.apache.tajo.master.rm.YarnTajoResourceManage
+ $ mvn clean install -Dtajo.resource.manager=org.apache.tajo.master.rm.YarnTajoResourceManage
  }}}