Use "allow list" terminology instead of whitelist

Description

We should replace WhiteListPolicy to AllowListPolicy (marking the previous one as deprecated).

See https://issues.apache.org/jira/browse/CASSANDRA-15862 for more info.

Environment

None

Pull Requests

None

Assignee

Alan Boudreault

Reporter

Alan Boudreault

Fix versions

None

Labels

None

PM Priority

None

External issue ID

None

Doc Impact

None

Reviewer

None

Size

None

Pull Request

None

Priority

Major
Configure