Fixing adtran driver config syntax

Change-Id: I84de4a65caf05c65efbc242c24f9bc944897dccf
diff --git a/tosca-configs/att-workflow/bbwf-fabric.yaml b/tosca-configs/att-workflow/bbwf-fabric.yaml
index 2b56ae3..8c33bd4 100755
--- a/tosca-configs/att-workflow/bbwf-fabric.yaml
+++ b/tosca-configs/att-workflow/bbwf-fabric.yaml
@@ -148,10 +148,12 @@
       properties:
         name: /onos/v1/network/configuration/devices
         value: >
-          "of:00000024454a6be4" : {
-            "basic" : {
-              "name" : "ADTRAN OLT",
-              "driver" : "voltha"
+          {
+            "of:00000024454a6be4" : {
+              "basic" : {
+                "name" : "ADTRAN OLT",
+                "driver" : "voltha"
+              }
             }
           }
       requirements: