GUACAMOLE-119: Add Apache RAT validation to build.

extensions/guacamole-auth-jdbc/pom.xml

@@ -15,6 +15,31 @@
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
     </properties>
 
+    <build>
+        <plugins>
+
+            <!-- Verify format using Apache RAT -->
+            <plugin>
+                <groupId>org.apache.rat</groupId>
+                <artifactId>apache-rat-plugin</artifactId>
+                <version>0.12</version>
+
+                <!-- Bind RAT to validate phase -->
+                <executions>
+                    <execution>
+                        <id>validate</id>
+                        <phase>validate</phase>
+                        <goals>
+                            <goal>check</goal>
+                        </goals>
+                    </execution>
+                </executions>
+
+            </plugin>
+
+        </plugins>
+    </build>
+
     <modules>
 
         <!-- Distribution .tar.gz -->