TLS Subscriptions with GlobalSign Email Validation
Added a new option for the include parameter, tls_authorizations.globalsign_email_challenge, for the following requests: GET /tls/domains, GET /tls/subscriptions , GET /tls/subscriptions/{tls_subscription_id}.
Added POST /tls/subscriptions/{tls_subscription_id}/authorizations/{tls_authorization_id}/globalsign_email_challenges for creating GlobalSign email challenges which can be used for validating domains with email.
Added DELETE /tls/subscriptions/{tls_subscription_id}/authorizations/{tls_authorization_id}/globalsign_email_challenges/{globalsign_email_challenge_id} for removing an email challenge.
Prior change: Add Compute backend and resource limit metrics
Following change: Add region to New Relic logging endpoint schema
