Enable checkstyle rule to enforce package-info.java files

Change-Id: If837601380e4950b46ad1332bd3c20ef59cc216e
diff --git a/tools/build/conf/src/main/resources/onos/suppressions.xml b/tools/build/conf/src/main/resources/onos/suppressions.xml
index a71d941..6d8f198 100644
--- a/tools/build/conf/src/main/resources/onos/suppressions.xml
+++ b/tools/build/conf/src/main/resources/onos/suppressions.xml
@@ -29,4 +29,12 @@
     <suppress files=".*" checks="HiddenField"/>
     <suppress files=".java" checks="NewlineAtEndOfFile"/>
 
+    <!-- Suppressions for unit testing code -->
+    <suppress checks="JavadocPackage"
+              files=".*/src/test/.*.java"
+            />
+
+    <suppress checks="JavadocPackage"
+              files=".*/thirdparty/.*.java"/>
+
 </suppressions>