image_import: debian: install sdk with apt (#257)
image_import: debian: install sdk with apt (#257)

sdk post script is working again, use apt to install it instead of
skiping the post install script with dpkg
GoogleCloudPlatform/compute-image-import,GoogleCloudPlatform/compute-daisy,GoogleCloudPlatform/compute-image-import,GoogleCloudPlatform/compute-image-tools,GoogleCloudPlatform/compute-image-tools,zmarano/compute-image-tools,zmarano/compute-image-tools,zmarano/compute-image-tools,GoogleCloudPlatform/compute-daisy,GoogleCloudPlatform/compute-image-tools,adjackura/compute-image-tools,adjackura/compute-image-tools,adjackura/compute-image-tools,GoogleCloudPlatform/compute-image-import