windows import: deflake NTP setup (#814)
windows import: deflake NTP setup (#814)

The deregister/register doesn't appear to do anything, so remove it all to deflake import
Running tests now to ensure this wasn't there for some forgotten reason
zmarano/compute-image-tools,zmarano/compute-image-tools,GoogleCloudPlatform/compute-image-import,adjackura/compute-image-tools,GoogleCloudPlatform/compute-image-import,adjackura/compute-image-tools,GoogleCloudPlatform/compute-image-import,zmarano/compute-image-tools,adjackura/compute-image-tools,GoogleCloudPlatform/compute-image-tools,GoogleCloudPlatform/compute-daisy,GoogleCloudPlatform/compute-image-tools,GoogleCloudPlatform/compute-daisy,GoogleCloudPlatform/compute-image-tools