Ruby CLI gem correctly handles Users/Hosts with api_key_enabled

[jvanderhoof]

Validate and fix any errors with the following workflows:

• Loading Policy with users and hosts with API keys disabled shows policy load success/failure, but not API keys
• Loading Policy updating users and hosts with previously enabled API keys shows policy load success/failure
• Loading Policy updating users and hosts with previously disabled API keys shows policy load success/failure and generated API keys
• Attempt to rotate disabled API results in a helpful error message
• Attempt to authenticate as a user/host with a disabled API key results in a authentication failure

Related to: cyberark/conjur/issues/1359