[CORD-1108] Refactoring OFDPA Group Handler

Create package "ofdpa" under pipeline package
Move helper functions and classes to OfdpaGroupHandlerUtility

Change-Id: I47e42f2c8afc9088ed684cd6a087233a82c452f6
diff --git a/drivers/default/src/main/resources/onos-drivers.xml b/drivers/default/src/main/resources/onos-drivers.xml
index 5b00408..59144a5 100644
--- a/drivers/default/src/main/resources/onos-drivers.xml
+++ b/drivers/default/src/main/resources/onos-drivers.xml
@@ -77,7 +77,7 @@
     <driver name="ofdpa" extends="default"
             manufacturer="Broadcom Corp." hwVersion="OF-DPA i12_1.7" swVersion="OF-DPA i12_1.7">
         <behaviour api="org.onosproject.net.behaviour.Pipeliner"
-                   impl="org.onosproject.driver.pipeline.Ofdpa2Pipeline"/>
+                   impl="org.onosproject.driver.pipeline.ofdpa.Ofdpa2Pipeline"/>
         <behaviour api="org.onosproject.openflow.controller.ExtensionTreatmentInterpreter"
                    impl="org.onosproject.driver.extensions.OfdpaExtensionTreatmentInterpreter" />
         <behaviour api="org.onosproject.net.behaviour.ExtensionTreatmentResolver"
@@ -94,7 +94,7 @@
     <driver name="ofdpa3" extends="default"
             manufacturer="Broadcom Corp." hwVersion="OF-DPA 2.0" swVersion="OF-DPA 2.0">
         <behaviour api="org.onosproject.net.behaviour.Pipeliner"
-                   impl="org.onosproject.driver.pipeline.Ofdpa3Pipeline"/>
+                   impl="org.onosproject.driver.pipeline.ofdpa.Ofdpa3Pipeline"/>
         <behaviour api="org.onosproject.openflow.controller.ExtensionTreatmentInterpreter"
                    impl="org.onosproject.driver.extensions.Ofdpa3ExtensionTreatmentInterpreter" />
         <behaviour api="org.onosproject.net.behaviour.ExtensionTreatmentResolver"
@@ -111,13 +111,13 @@
     <driver name="qmx-ofdpa3" extends="ofdpa3"
             manufacturer="Broadcom Corp." hwVersion="Qmx" swVersion="Qmx">
             <behaviour api="org.onosproject.net.behaviour.Pipeliner"
-                   impl="org.onosproject.driver.pipeline.Ofdpa3QmxPipeline"/>
+                   impl="org.onosproject.driver.pipeline.ofdpa.Ofdpa3QmxPipeline"/>
     </driver>
 
     <driver name="znyx-ofdpa" extends="default"
             manufacturer="ZNYX Networks" hwVersion=".*" swVersion=".*OF-DPA.*">
         <behaviour api="org.onosproject.net.behaviour.Pipeliner"
-                   impl="org.onosproject.driver.pipeline.Ofdpa3Pipeline"/>
+                   impl="org.onosproject.driver.pipeline.ofdpa.Ofdpa3Pipeline"/>
         <behaviour api="org.onosproject.openflow.controller.ExtensionTreatmentInterpreter"
                    impl="org.onosproject.driver.extensions.Ofdpa3ExtensionTreatmentInterpreter" />
         <behaviour api="org.onosproject.net.behaviour.ExtensionTreatmentResolver"
@@ -136,7 +136,7 @@
             manufacturer="ONF"
             hwVersion="OF1.3 Software Switch from CPqD" swVersion="for Group Chaining">
         <behaviour api="org.onosproject.net.behaviour.Pipeliner"
-                   impl="org.onosproject.driver.pipeline.CpqdOfdpa2Pipeline"/>
+                   impl="org.onosproject.driver.pipeline.ofdpa.CpqdOfdpa2Pipeline"/>
     </driver>
 
     <!--  Emulation of the OFDPA pipeline using a CPqD OF 1.3 software switch.
@@ -147,7 +147,7 @@
             manufacturer="ONF"
             hwVersion="OF1.3 Software Switch from CPqD" swVersion="for Group Chaining">
         <behaviour api="org.onosproject.net.behaviour.Pipeliner"
-                   impl="org.onosproject.driver.pipeline.CpqdOfdpa2VlanPipeline"/>
+                   impl="org.onosproject.driver.pipeline.ofdpa.CpqdOfdpa2VlanPipeline"/>
     </driver>
 
     <!--  Emulation of the OFDPA pipeline using a OVS OF 1.3 software switch.
@@ -158,7 +158,7 @@
             manufacturer="ONF"
             hwVersion="OFDPA OVS" swVersion="OFDPA OVS">
         <behaviour api="org.onosproject.net.behaviour.Pipeliner"
-                   impl="org.onosproject.driver.pipeline.OvsOfdpa2Pipeline"/>
+                   impl="org.onosproject.driver.pipeline.ofdpa.OvsOfdpa2Pipeline"/>
     </driver>
 
     <driver name="celestica" extends="default"