Do not bind logger to global object, now it's a part of serverOptions

lib/server-options.js

@@ -3,6 +3,7 @@
 const fqdn = require('@carto/fqdn-sync');
 var _ = require('underscore');
 var OverviewsQueryRewriter = require('./utils/overviews-query-rewriter');
+const Logger = require('./utils/logger');
 
 var rendererConfig = _.defaults(global.environment.renderer || {}, {
     cache_ttl: 60000, // milliseconds
@@ -127,7 +128,7 @@ module.exports = {
     varnish_purge_enabled: global.environment.varnish.purge_enabled,
     fastly: global.environment.fastly || {},
     cache_enabled: global.environment.cache_enabled,
-    log_format: global.environment.log_format,
     useProfiler: global.environment.useProfiler,
-    pubSubMetrics: Object.assign({ enabled: false }, global.environment.pubSubMetrics)
+    pubSubMetrics: Object.assign({ enabled: false }, global.environment.pubSubMetrics),
+    logger: new Logger()
 };