The internal GCP library was originally placed into `internal/upload`
directory, since its purpose was mainly to upload and import built
images to GCP.
Functionality for other cloud-provider-specific libraries is broader,
however scattered around the `internal/` directory based on purpose (e.g. in
`internal/boot` and `internal/upload`). Since all parts of provider-specific
library usually share some common pieces (e.g. authentication), it makes
sense to consolidate them into a single package (e.g. in
`internal/cloud/<provider>`).
Create `internal/cloud` directory, where all cloud-provider-specific
internal libraries should be consolidated. Start with GCP.
Signed-off-by: Tomas Hozza <thozza@redhat.com>
075373a51e