Reverting pom.xml change that broke build

@@ -352,13 +352,6 @@
     </dependencies>
     </dependencies>
 
 
     <build>
     <build>
-        <extensions>
-            <extension>
-                <groupId>kr.motd.maven</groupId>
-                <artifactId>os-maven-plugin</artifactId>
-                <version>1.2.3.Final</version>
-            </extension>
-        </extensions>
         <pluginManagement>
         <pluginManagement>
             <plugins>
             <plugins>
                 <plugin>
                 <plugin>