ISSUE #217: Enable apache-rat check to output result to console

Descriptions of the changes in this PR:

- bump `apache-rat` to 0.12. since `outputConsole` is only supported since 0.12
- enable `outputConsole` to dump the files that have unapproved licences.

Author: Jia Zhai <zhaijia@apache.org>

Reviewers: Sijie Guo <sijie@apache.org>

This closes #218 from zhaijack/output_ratcheck_results_to_console, closes #217
diff --git a/pom.xml b/pom.xml
index 550215e..0a79de6 100644
--- a/pom.xml
+++ b/pom.xml
@@ -124,7 +124,7 @@
     <stats-util.version>0.0.58</stats-util.version>
     <zookeeper.version>3.5.3-beta</zookeeper.version>
     <!-- plugin dependencies -->
-    <apache-rat-plugin.version>0.7</apache-rat-plugin.version>
+    <apache-rat-plugin.version>0.12</apache-rat-plugin.version>
     <cobertura-maven-plugin.version>2.7</cobertura-maven-plugin.version>
     <coveralls-maven-plugin.version>4.1.0</coveralls-maven-plugin.version>
     <findbugs-maven-plugin.version>3.0.3</findbugs-maven-plugin.version>
@@ -259,6 +259,7 @@
             <!-- Grafana -->
             <exclude>docker/grafana/dashboards/*.json</exclude>
           </excludes>
+          <consoleOutput>true</consoleOutput>
         </configuration>
       </plugin>
       <!-- Report jacoco coverage to coveralls.io -->