Renamed tofino driver to barefoot

For consistency with other drivers.

Also fixed ClassDefNotFoundException when loading driver.

Change-Id: If000d9b9fdae659aa32e0a5898885b52bc5ca89b
diff --git a/drivers/barefoot/src/main/resources/barefoot-drivers.xml b/drivers/barefoot/src/main/resources/barefoot-drivers.xml
index 4424e5b..9a2ebcc 100644
--- a/drivers/barefoot/src/main/resources/barefoot-drivers.xml
+++ b/drivers/barefoot/src/main/resources/barefoot-drivers.xml
@@ -15,7 +15,7 @@
   ~ limitations under the License.
   -->
 <drivers>
-    <driver name="tofino" manufacturer="Barefoot Networks" hwVersion="1.0" swVersion="1.0" extends="p4runtime">
+    <driver name="barefoot" manufacturer="Barefoot Networks" hwVersion="1.0" swVersion="1.0" extends="p4runtime">
         <behaviour api="org.onosproject.net.behaviour.PiPipelineProgrammable"
                    impl="org.onosproject.drivers.barefoot.TofinoPipelineProgrammable"/>
     </driver>