just a quick question will these changes be able to accommodate the new InstanceReturn type  for "Summary" api. It returns response of InstancesSummaryResult class,  and extends API result. I dont c any change that might cause concern but wanted to check.  I have already made changes to return type of "hitUrl" in InstanceUtil to take care of that.  

https://github.com/samarthgupta437/falcon-regression/blob/samarth/merlin-core/src/main/java/org/apache/falcon/regression/core/response/InstancesSummaryResult.java