fix timeout issue for DT functional physical tests

Change-Id: I6c8b0c162de5e0f13a212a536bf27bb007572c36
diff --git a/jjb/pipeline/voltha-dt-physical-functional-tests.groovy b/jjb/pipeline/voltha-dt-physical-functional-tests.groovy
index dd782cc..dbc60c8 100644
--- a/jjb/pipeline/voltha-dt-physical-functional-tests.groovy
+++ b/jjb/pipeline/voltha-dt-physical-functional-tests.groovy
@@ -23,7 +23,7 @@
     label "${params.buildNode}"
   }
   options {
-    timeout(time: 240, unit: 'MINUTES')
+    timeout(time: 340, unit: 'MINUTES')
   }
 
   environment {