Image import: Support release info changes in new versions of apt (#1738)
Image import: Support release info changes in new versions of apt (#1738)

This PR first tries running apt without --allow-releaseinfo-change; if that fails, it tries again with that flag.
GoogleCloudPlatform/compute-image-tools,GoogleCloudPlatform/compute-image-tools,GoogleCloudPlatform/compute-daisy,GoogleCloudPlatform/compute-image-tools,zmarano/compute-image-tools,adjackura/compute-image-tools,GoogleCloudPlatform/compute-image-import,zmarano/compute-image-tools,GoogleCloudPlatform/compute-image-import,GoogleCloudPlatform/compute-daisy,adjackura/compute-image-tools,GoogleCloudPlatform/compute-image-import,zmarano/compute-image-tools,adjackura/compute-image-tools