Simplifying rules and providing sensible defaults

Updated cordvtn, dhcp, fwd, onos-api, of-api, onlab-rest, onos-rest, onos-gui

Also, fixed checkstyle error print

Change-Id: I9d6ab76791e8603678079067a3b4e007ca7c4667
diff --git a/pom.xml b/pom.xml
index d14e38a..b389778 100644
--- a/pom.xml
+++ b/pom.xml
@@ -105,8 +105,28 @@
     -->
     <repositories>
         <repository>
+            <id>central</id>
+            <name>Central Repository</name>
+            <url>http://repo.maven.apache.org/maven2</url>
+            <layout>default</layout>
+            <snapshots>
+                <enabled>false</enabled>
+            </snapshots>
+            <releases>
+                <enabled>true</enabled>
+                <updatePolicy>never</updatePolicy>
+                <checksumPolicy>fail</checksumPolicy>
+            </releases>
+        </repository>
+
+        <repository>
             <id>snapshots</id>
             <url>https://oss.sonatype.org/content/repositories/snapshots</url>
+            <snapshots>
+                <enabled>true</enabled>
+                <updatePolicy>never</updatePolicy>
+                <checksumPolicy>fail</checksumPolicy>
+            </snapshots>
         </repository>
     </repositories>