Always enabling persistency on AWS based scale job

Change-Id: If01113999b1127c117819ab9d6302270a81ee21e
diff --git a/jjb/voltha-test/voltha.yaml b/jjb/voltha-test/voltha.yaml
index b89afff..239bf0f 100644
--- a/jjb/voltha-test/voltha.yaml
+++ b/jjb/voltha-test/voltha.yaml
@@ -409,7 +409,7 @@
             profile: '1T4GEM'
             num-of-onos: '3'
             num-of-atomix: '3'
-            time: '5'
+            time: '7'
 
         # Certification (Radisys) POD test job - master versions: uses tech profile on voltha branch
       - 'build_voltha_pod_test':