Revert "Push driver with pipeconfId when available"

This reverts commit 4dd6cccad747066377830a4c50e7d5d14a41c613.

Change-Id: I4a8a01d332a40c80f5f4342c55ae6e03e64a1fa7
diff --git a/tools/dev/mininet/bmv2.py b/tools/dev/mininet/bmv2.py
index a8034c2..0c0fc15 100644
--- a/tools/dev/mininet/bmv2.py
+++ b/tools/dev/mininet/bmv2.py
@@ -131,7 +131,7 @@
     def getDeviceConfig(self, srcIP):
 
         basicCfg = {
-            "driver": ("bmv2:" + self.pipeconfId) if self.pipeconfId != None else "bmv2"
+            "driver": "bmv2"
         }
 
         if self.longitude and self.latitude: