Extending the timeout for nightly jobs

Change-Id: I21d71cd5c9955c84e2e93f09291e533647c10e12
diff --git a/jjb/voltha-test/voltha-nightly-jobs.yaml b/jjb/voltha-test/voltha-nightly-jobs.yaml
index bc70d30..1d11c4c 100644
--- a/jjb/voltha-test/voltha-nightly-jobs.yaml
+++ b/jjb/voltha-test/voltha-nightly-jobs.yaml
@@ -304,7 +304,7 @@
 
     oltAdapterAppLabel: 'adapter-open-olt'
     enableMultiUni: false
-    timeout: 240
+    timeout: 270
 
     parameters:
       - string: