Extended timeout for device removal step in voltha scale pipeline

Change-Id: I845b00da88803428890aaa5b026f2200bac0670a
diff --git a/jjb/pipeline/voltha/master/voltha-scale-test.groovy b/jjb/pipeline/voltha/master/voltha-scale-test.groovy
index 5c7ddbf..1f7df02 100644
--- a/jjb/pipeline/voltha/master/voltha-scale-test.groovy
+++ b/jjb/pipeline/voltha/master/voltha-scale-test.groovy
@@ -629,7 +629,7 @@
     }
     stage("Device removal") {
       options {
-          timeout(time: 5, unit: 'MINUTES')
+          timeout(time: 15, unit: 'MINUTES')
       }
       steps {
         sh '''