Test both creation orders in duplicate IP test
Specify range's domain
Move CydnsRecord.full_clean to LabelDomainMixin

(It involves a label–domain–fqdn thing so that's where it belongs.)
Test both creation orders in AR–SI same-name test
Fix errors caused by full_clean change
Fix some more cleaning and validation issues
Add CNAME domain container test
Add CNAME name uniqueness test
Fix AddressRecord target validation test

ip_type wasn't being passed to the constructor; objects were being
created with duplicate names in a way that will probably cause
validation errors in the future.
Add CNAME target validation test
Alphabetize imports
Use create_basic_dns_data; refactor ctnr creation
Add assertObjects{,Dont}Conflict and use them
Change variable names to reduce confusion
Use assertObjects{,Dont}Conflict in more tests
Add CNAME–A/MX/SOA conflict test
Use already-existing variable
Refactor zone and range bootstrapping code
Add StaticInterface–CNAME name conflict test
Remove unnecessary whitespace