Generate copyright year in swagger template code

- exclude generated source code from checkstyle by default

Change-Id: I3f79183a8aae1f24d36558860555b5b0298cd8c3
diff --git a/tools/build/conf/src/main/resources/onos/suppressions.xml b/tools/build/conf/src/main/resources/onos/suppressions.xml
index bfa6412..dce87bc 100644
--- a/tools/build/conf/src/main/resources/onos/suppressions.xml
+++ b/tools/build/conf/src/main/resources/onos/suppressions.xml
@@ -54,4 +54,8 @@
 
     <!-- Suppressions for yangutils generated code -->
     <suppress files="org.onosproject.yang.gen.v1.*" checks="Javadoc.*" />
+
+    <!-- Suppress checks for Maven-generated code -->
+    <suppress files="[/\\]target[/\\]" checks=".*"/>
+
 </suppressions>