[CORD-801] OFDPA pipeline for OpenvSwitch

Drops TTL_IN, TTL_OUT and MPLS_BOS instructions which are not supported by OpenvSwitch.
This will allow us to run OFDPA pipeline with OpenvSwitch >= 2.6.0

Change-Id: Icfa6f2fdaa857877a57ae4c719354483b24c5816
diff --git a/drivers/default/src/main/java/org/onosproject/driver/pipeline/Ofdpa2Pipeline.java b/drivers/default/src/main/java/org/onosproject/driver/pipeline/Ofdpa2Pipeline.java
index 890af99..cadca75 100644
--- a/drivers/default/src/main/java/org/onosproject/driver/pipeline/Ofdpa2Pipeline.java
+++ b/drivers/default/src/main/java/org/onosproject/driver/pipeline/Ofdpa2Pipeline.java
@@ -147,10 +147,6 @@
     public void init(DeviceId deviceId, PipelinerContext context) {
         this.deviceId = deviceId;
 
-        // Initialize OFDPA group handler
-        groupHandler = new Ofdpa2GroupHandler();
-        groupHandler.init(deviceId, context);
-
         serviceDirectory = context.directory();
         coreService = serviceDirectory.get(CoreService.class);
         flowRuleService = serviceDirectory.get(FlowRuleService.class);
@@ -158,12 +154,22 @@
         flowObjectiveStore = context.store();
         deviceService = serviceDirectory.get(DeviceService.class);
 
-        driverId = coreService.registerApplication(
-                "org.onosproject.driver.Ofdpa2Pipeline");
+        initDriverId();
+        initGroupHander(context);
 
         initializePipeline();
     }
 
+    protected void initDriverId() {
+        driverId = coreService.registerApplication(
+                "org.onosproject.driver.Ofdpa2Pipeline");
+    }
+
+    protected void initGroupHander(PipelinerContext context) {
+        groupHandler = new Ofdpa2GroupHandler();
+        groupHandler.init(deviceId, context);
+    }
+
     protected void initializePipeline() {
         // OF-DPA does not require initializing the pipeline as it puts default
         // rules automatically in the hardware. However emulation of OFDPA in