fix reading instance_id on follow-on deploy (#253)

Author: bmc-msft

src/deployment/deploy.py

@@ -480,7 +480,7 @@ def add_instance_id(self):
         blob_client = client.get_blob_client(container_name, blob_name)
         if blob_client.exists():
             logger.debug("instance_id already exists")
-            instance_id = uuid.UUID(blob_client.download_blob().readall())
+            instance_id = uuid.UUID(blob_client.download_blob().readall().decode())
         else:
             logger.debug("creating new instance_id")
             instance_id = uuid.uuid4()