js_test.go should generate & test zonefile output too (#986)

* js_test.go: Do a zonefile test if $TESTNAME/parse_tests/{zonefile} exists.
* Add parse_tests zone files for all the tests that make sense.
* js_test.go: Addd the test datafile when displaying failures.
* 007-importTransformTTL.js: Was referring to a non-existent domain.
* 012-duration.js: Had duplicate DNS records.
* 029-dextendsub.js: Move CF-related tests to separate test.
* validate.go: Report non-existent domains as an error.
* cloudflareProvider.go: newCloudflare should not talk to the API.

pkg/js/parse_tests/007-importTransformTTL.js

@@ -1,4 +1,5 @@
 var TRANSFORM_INT = [
     {low: "0.0.0.0", high: "1.1.1.1", newBase: "2.2.2.2" }
 ]
+D("foo2.com","reg");
 D("foo.com","reg",IMPORT_TRANSFORM(TRANSFORM_INT,"foo2.com",60))