dist/ami: Support different products for the AMI
dist/ami: Support different products for the AMI

Let's add a PRODUCT variable, similar to build_rpm.sh, for example, so
that we can override package names for enterprise AMIs.

Message-Id: <8eb20c787ec1f1499fd49f9bcd57f7c737de6bad@scylladb.com>

scylladb/scylla,avikivity/scylla,avikivity/scylla,scylladb/scylla,avikivity/scylla,scylladb/scylla,scylladb/scylla