Fixed duplicate dependency in incubator/net/pom.xml

Change-Id: I8afff7afebe7bf22af7a8c3ff9ec1c0c9dbff861

@@ -56,14 +56,6 @@
         </dependency>
 
         <dependency>
-            <groupId>org.onosproject</groupId>
-            <artifactId>onos-core-common</artifactId>
-            <version>${project.version}</version>
-            <classifier>tests</classifier>
-            <scope>test</scope>
-        </dependency>
-
-        <dependency>
             <groupId>org.easymock</groupId>
             <artifactId>easymock</artifactId>
             <scope>test</scope>