Improvements to the IoT Nirvana readme
Improvements to the IoT Nirvana readme

small fixes found when running through setup

use env vars to make copy paste command lines more efficient
CloudVLab/professional-services,GoogleCloudPlatform/professional-services,CloudVLab/professional-services,GoogleCloudPlatform/professional-services,CloudVLab/professional-services,GoogleCloudPlatform/professional-services,GoogleCloudPlatform/professional-services,GoogleCloudPlatform/professional-services,GoogleCloudPlatform/professional-services,CloudVLab/professional-services,CloudVLab/professional-services,CloudVLab/professional-services,GoogleCloudPlatform/professional-services,CloudVLab/professional-services,GoogleCloudPlatform/professional-services,GoogleCloudPlatform/professional-services