increase timeout for test jobs

Change-Id: I7446bf6677f1f29aebdaddebd09d50f313a328e9
diff --git a/jjb/pipeline/voltha-physical-functional-tests.groovy b/jjb/pipeline/voltha-physical-functional-tests.groovy
index c42e280..86a4db6 100644
--- a/jjb/pipeline/voltha-physical-functional-tests.groovy
+++ b/jjb/pipeline/voltha-physical-functional-tests.groovy
@@ -23,7 +23,7 @@
     label "${params.buildNode}"
   }
   options {
-    timeout(time: 180, unit: 'MINUTES')
+    timeout(time: 280, unit: 'MINUTES')
   }
 
   environment {