Specify "board_technology" for the OLTs in deployment config file.
Also remove unused yaml deployment configuration files.

Change-Id: I5d033e60483f1e723a352051545925e32735c3f2
diff --git a/deployment-configs/dt-berlin-pod-openonugo-DT.yaml b/deployment-configs/dt-berlin-pod-openonugo-DT.yaml
index 5f6d7f3..20c12ec 100644
--- a/deployment-configs/dt-berlin-pod-openonugo-DT.yaml
+++ b/deployment-configs/dt-berlin-pod-openonugo-DT.yaml
@@ -58,6 +58,7 @@
       serial: EC1912001814
       oltDebVersion: openolt_asgvolt64-3.4.8-eec0fc9e9a01dc0d35b0b8441e0a22a4c0cc51b4-100G-NNI.deb
       oltDebVersion23: openolt_asgvolt64-3.3.3-1a5d68b50d8bcc5ba6cb1630d3294c30c37cd2f5-100G-NNI.deb
+      board_technology: GPON
  
   hosts:
     src: