ONOS-3972 Implemented BMv2 device provider

BMv2 devices can now be discovered (along with port informations) using
net-cfg (see tools/test/config/bmv2-cfg.json)

Change-Id: Ief2ca790dceb4d047b75aae6c5e1a89a05215e5f
diff --git a/tools/test/configs/bmv2-cfg.json b/tools/test/configs/bmv2-cfg.json
new file mode 100644
index 0000000..20f4010
--- /dev/null
+++ b/tools/test/configs/bmv2-cfg.json
@@ -0,0 +1,10 @@
+{
+  "apps":{
+    "org.onosproject.bmv2":{
+      "devices":[{
+        "ip":"192.168.57.100",
+        "port":9090
+      }]
+    }
+  }
+}
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