dnsConfig -> domainConfig

this prepares for the incoming settings.getDnsConfig()

src/dns/noop.js

@@ -7,7 +7,7 @@ exports = module.exports = {
     get,
     del,
     wait,
-    verifyDnsConfig
+    verifyDomainConfig
 };
 
 const assert = require('assert'),
@@ -63,7 +63,7 @@ function wait(domainObject, location, type, value, options, callback) {
     callback();
 }
 
-function verifyDnsConfig(domainObject, callback) {
+function verifyDomainConfig(domainObject, callback) {
     assert.strictEqual(typeof domainObject, 'object');
     assert.strictEqual(typeof callback, 'function');