Pom fixes to correctly shade copycat jars.

Change-Id: I1ed97b32ad242e1c6d7c06387219308802a1f773
diff --git a/pom.xml b/pom.xml
index 0f376cd..5267aeb 100644
--- a/pom.xml
+++ b/pom.xml
@@ -23,6 +23,14 @@
         <maven>3.0.1</maven>
     </prerequisites>
 
+    <!--- Needed for copycat. Remove before official release -->
+    <repositories>
+        <repository>
+            <id>snapshots</id>
+            <url>https://oss.sonatype.org/content/repositories/snapshots</url>
+        </repository>
+    </repositories>
+
     <parent>
         <groupId>org.onosproject</groupId>
         <artifactId>onos-base</artifactId>