Initial check-in

[tlimoncelli]

This is a rewrite of how DNS records get from dnsconfig.js to the DomainConfig.Records ([]*RecordConfig) structure.

What problem are we trying to solve?

• Current implementation of models.RecordConfig wastes memory. Every new rType adds fileds which are usually unused.
• The code for record types is scattered all over the code base, making maintenance difficult.
• Testing record types is difficult.
• Testing "builders" is extremely difficult.

Solution

• Move the processing of DNS records (A, MX, SRV, etc) in dnsconfig.js from Javascript to Go
• Instead of storing a records field's in RecordConfig (which is growing without bounds), store a pointer to a type-specific struct: Different struct for A, MX, SRV, etc.