TTL type mismatch in CrConfig

The A and AAAA types in the Config -> ttls section of the CrConfig are a different type than the A and AAAA values in the DeliveryService -> ttls section of the CrConfig. In the config sections they are strings but in the DS sections they are ints. Since goTM uses a common struct for TTLs, this causes an parsing the CrConfig in goTM. The CrConfig should be updated so that the types are consistent.

ttls in the Config sections:

"ttls":

{ "A": "3600", "DNSKEY": "30", "DS": "30", "SOA": "86400", "NS": "3600", "AAAA": "3600" }

,

ttls in the DS section:

"ttls":

{ "A": 30, "SOA": "86400", "NS": "3600", "AAAA": 30 }

,