Make the verifyDnsConfig() api return the valid credentials

src/dns/route53.js

@@ -218,11 +218,19 @@ function verifyDnsConfig(dnsConfig, domain, ip, callback) {
     assert.strictEqual(typeof ip, 'string');
     assert.strictEqual(typeof callback, 'function');
 
+    var credentials = {
+        provider: dnsConfig.provider,
+        accessKeyId: dnsConfig.accessKeyId,
+        secretAccessKey: dnsConfig.secretAccessKey,
+        region: dnsConfig.region || 'us-east-1',
+        endpoint: dnsConfig.endpoint || null
+    };
+
     dns.resolveNs(domain, function (error, nameservers) {
         if (error && error.code === 'ENOTFOUND') return callback(new SubdomainError(SubdomainError.BAD_FIELD, 'Unable to resolve nameservers for this domain'));
         if (error || !nameservers) return callback(error || new Error('Unable to get nameservers'));
 
-        getHostedZone(dnsConfig, domain, function (error, zone) {
+        getHostedZone(credentials, domain, function (error, zone) {
             if (error) return callback(error);
 
             if (!_.isEqual(zone.DelegationSet.NameServers.sort(), nameservers.sort())) {
@@ -230,12 +238,12 @@ function verifyDnsConfig(dnsConfig, domain, ip, callback) {
                 return callback(new SubdomainError(SubdomainError.BAD_FIELD, 'Domain nameservers are not set to Route53'));
             }
 
-            upsert(dnsConfig, domain, 'my', 'A', [ ip ], function (error, changeId) {
+            upsert(credentials, domain, 'my', 'A', [ ip ], function (error, changeId) {
                 if (error) return callback(new SubdomainError(SubdomainError.INTERNAL_ERROR, error));
 
                 debug('verifyDnsConfig: A record added with change id %s', changeId);
 
-                callback();
+                callback(null, credentials);
             });
         });
     });