Alexey Bezhan 509441f1d9 Add validators for service_letter_contact_id and reply_to ...

Validators check that service_letter_contact_id belongs to the
same service as the notification/template.

Generic reply_to validator calls the correct function for the given
type (for either notification or template). It can be used by the
template API endpoints to verify that given reply_to ID has the same
service_id as the template itself.

The original approach was to create a DB foreign key constraint,
but this caused issues with the `version_class` decorator saving
related Service objects without creating a history record.

2017-12-19 10:23:24 +00:00

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