configurable PPPoE flow per service

Change-Id: I9876c281d56b2e0d25b2ddd7e84bd54359788633
diff --git a/impl/src/main/java/org/opencord/olt/impl/OltFlowServiceInterface.java b/impl/src/main/java/org/opencord/olt/impl/OltFlowServiceInterface.java
index e55c789..b00594f 100644
--- a/impl/src/main/java/org/opencord/olt/impl/OltFlowServiceInterface.java
+++ b/impl/src/main/java/org/opencord/olt/impl/OltFlowServiceInterface.java
@@ -70,6 +70,14 @@
     boolean hasDhcpFlows(Port port, UniTagInformation uti);
 
     /**
+     * Checks if the pppoe flows are installed.
+     * @param port the port
+     * @param uti the UniTagInformation to check for
+     * @return true if installed, false otherwise.
+     */
+    boolean hasPppoeFlows(Port port, UniTagInformation uti);
+
+    /**
      * Checks if the subscriber flows are installed.
      * @param port the port
      * @param uti the UniTagInformation to check for