release: add cloudware oracle targets to package and upload .oci files

• requires base tar & flua, qemu-tools & curl from ports
• set ORACLE_PAR_URL to upload to local file:/// dir or cloud buckets

Reviewed by: emaste
Approved by: cperciva
Differential Revision: https://reviews.freebsd.org/D48382
Sponsored by: SkunkWerks, GmbH