Rename to denylist

[professor]

No description provided.

[professor]

I'm curious if you consider this to be a breaking change. If so, do you have any suggestions on how to roll out this PR?

[professor]

@mlarraz I'm curious if there is any interest in merging this PR.

If yes, I'm willing to do the work to deprecate the remaining references to blacklist and whitelist. Here's an example of work that I started ... (and I'm willing to finish)

module Makara
  class ConfigParser
    DEFAULTS = {
      primary_ttl: 5,
      deny_list_duration: 30,
      sticky: true
    }

    DEPRECATED_KEYS = {
      blacklist_duration:   :deny_list_duration,
      ...