Changing names of files for GPON berlin DT

Change-Id: I21349d37d15a733fd704aaaeeacfef4f745ee730
diff --git a/tests/data/dt-berlin-pod-gpon-sadis.json b/tests/data/dt-berlin-pod-gpon-DT-sadis.json
similarity index 100%
rename from tests/data/dt-berlin-pod-gpon-sadis.json
rename to tests/data/dt-berlin-pod-gpon-DT-sadis.json