Move mail related settings to new mail route

there is quite a bit of circular dep between settings, platform and
mail code. this will be removed in future commits.

src/test/mail-test.js

@@ -0,0 +1,108 @@
+/* global it:false */
+/* global describe:false */
+/* global before:false */
+/* global after:false */
+
+'use strict';
+
+var async = require('async'),
+    config = require('../config.js'),
+    database = require('../database.js'),
+    expect = require('expect.js'),
+    mail = require('../mail.js'),
+    settingsdb = require('../settingsdb.js');
+
+function setup(done) {
+    config._reset();
+    config.set('fqdn', 'example.com');
+    config.set('provider', 'caas');
+
+    async.series([
+        database.initialize,
+    ], done);
+}
+
+function cleanup(done) {
+    async.series([
+        database._clear,
+        database.uninitialize
+    ], done);
+}
+
+describe('Settings', function () {
+    describe('values', function () {
+        before(setup);
+        after(cleanup);
+
+        it('can set mail from validation', function (done) {
+            mail.setMailFromValidation(true, function (error) {
+                expect(error).to.be(null);
+                done();
+            });
+        });
+
+        it('can get mail from validation', function (done) {
+            mail.getMailFromValidation(function (error, enabled) {
+                expect(error).to.be(null);
+                expect(enabled).to.be(true);
+                done();
+            });
+        });
+
+        it('can get catch all address', function (done) {
+            mail.getCatchAllAddress(function (error, address) {
+                expect(error).to.be(null);
+                expect(address).to.eql([ ]);
+                done();
+            });
+        });
+
+        it('can set catch all address', function (done) {
+            mail.setCatchAllAddress([ 'user1', 'user2' ], function (error) {
+                expect(error).to.be(null);
+
+                mail.getCatchAllAddress(function (error, address) {
+                    expect(error).to.be(null);
+                    expect(address).to.eql([ 'user1', 'user2' ]);
+                    done();
+                });
+            });
+        });
+
+        it('can get mail relay', function (done) {
+            mail.getMailRelay(function (error, address) {
+                expect(error).to.be(null);
+                expect(address).to.eql({ provider: 'cloudron-smtp' });
+                done();
+            });
+        });
+
+        it('can set mail relay', function (done) {
+            var relay = { provider: 'external-smtp', host: 'mx.foo.com', port: 25 };
+            settingsdb.set(mail.MAIL_RELAY_KEY, JSON.stringify(relay), function (error) { // skip the mail server verify()
+                expect(error).to.be(null);
+
+                mail.getMailRelay(function (error, address) {
+                    expect(error).to.be(null);
+                    expect(address).to.eql(relay);
+                    done();
+                });
+            });
+        });
+
+        it('can set mail config', function (done) {
+            mail.setMailConfig({ enabled: true }, function (error) {
+                expect(error).to.be(null);
+                done();
+            });
+        });
+
+        it('can get mail config', function (done) {
+            mail.getMailConfig(function (error, mailConfig) {
+                expect(error).to.be(null);
+                expect(mailConfig.enabled).to.be(true);
+                done();
+            });
+        });
+    });
+});