Add log config logger option

lib/config.js

@@ -261,7 +261,7 @@ internals.server = Validate.object({
         .default(),
     log: Validate.object({
         level: Validate.valid('emergency', 'alert', 'critical', 'error', 'warning', 'notice', 'info', 'debug'),
-        logger: Validate.object().optional()
+        logger: Validate.object().optional().allow('std').allow('pino')
     })
         .allow(false)
         .default(false),

lib/core.js

@@ -176,11 +176,21 @@ exports = module.exports = internals.Core = class {
     }
 
     _initializeLog() {
+
         if (!this.settings.log) {
             return;
         }
 
-        Log.plugin.register(this.root, this.settings.log);
+        const { level, logger: logCfg } = this.settings.log;
+        let logger = new Log.Stdlogger(process.stdout, process.stderr);
+        if (logCfg === 'pino') {
+            logger = new Log.Pinologger(process.stdout);
+        }
+        else if (typeof logCfg === 'object') {
+            logger = logCfg;
+        }
+
+        Log.plugin.register(this.root, { level, logger });
     }
 
     _info() {

lib/server.js

@@ -1,7 +1,6 @@
 'use strict';
 
 const Hoek = require('@hapi/hoek');
-const Log = require('@hapi/log');
 const Shot = require('@hapi/shot');
 const Somever = require('@hapi/somever');
 const Teamwork = require('@hapi/teamwork');