Make OpenFlow port configurable via cfg command

Example:
cfg set org.onosproject.openflow.controller.impl.OpenFlowControllerImpl openflowPort 6633

Change-Id: I2fa4b0db671003d0b357e63df619f1b0dec38e03
diff --git a/openflow/ctl/pom.xml b/openflow/ctl/pom.xml
index 9f52cf7..683a09a 100644
--- a/openflow/ctl/pom.xml
+++ b/openflow/ctl/pom.xml
@@ -55,6 +55,10 @@
                 <groupId>org.apache.felix</groupId>
                 <artifactId>maven-scr-plugin</artifactId>
             </plugin>
+            <plugin>
+                <groupId>org.onosproject</groupId>
+                <artifactId>onos-maven-plugin</artifactId>
+            </plugin>
         </plugins>
     </build>