SQOOP-225. Checkstyle module for detecting trailing white spaces.

This patch adds a checkstyle module to detect trailing white
spaces. It also removed various current instances of trailing
white spaces in the code.

From: Ahmed Radwan <ahmed@cloudera.com>

git-svn-id: https://svn.apache.org/repos/asf/incubator/sqoop/trunk@1150046 13f79535-47bb-0310-9956-ffa450edef68

src/test/checkstyle.xml

@@ -131,6 +131,12 @@
       <property name="tokens" value="COMMA, SEMI"/>
     </module>
 
+    <module name="Regexp">
+      <property name="format" value="[ \t]+$"/>
+      <property name="illegalPattern" value="true"/>
+      <property name="message" value="Trailing whitespace"/>
+    </module>
+
     <!-- Modifier Checks                                    -->
     <!-- See http://checkstyle.sf.net/config_modifiers.html -->
     <module name="ModifierOrder"/>