EUCA-5524 Made the debug error messages

java.lang.ClassNotFoundException: com.eucalyptus.cloudwatch.PutMetricDataResponseResponseType

disappear by harmonizing the CloudWatchMessages.groovy CloudWatchMessage method
setReply() with the equivalent methods in AutoScalingMessages.groovy and
LoadBalancimgMessages.groovy
Merge branch 'dev/ethomas/EUCA-5524' into testing