Removed explicit selection of latest OS image.
Removed explicit selection of latest OS image.

iamshital/azure-linux-automation,v-sirebb/azure-linux-automation,konkasoftci/azure-linux-automation,iamshital/azure-linux-automation,konkasoftci/azure-linux-automation,v-sirebb/azure-linux-automation,iamshital/azure-linux-automation,v-sirebb/azure-linux-automation,konkasoftci/azure-linux-automation