http2: reduce usage of require('util')

PR-URL: #26784
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>
Reviewed-By: Yongsheng Zhang <zyszys98@gmail.com>

lib/internal/http2/core.js

@@ -18,7 +18,6 @@ const net = require('net');
 const { Duplex } = require('stream');
 const tls = require('tls');
 const { URL } = require('url');
-const util = require('util');
 
 const { kIncomingMessage } = require('_http_common');
 const { kServerResponse } = require('_http_server');
@@ -120,6 +119,7 @@ const {
   validateTimerDuration
 } = require('internal/timers');
 const { isArrayBufferView } = require('internal/util/types');
+const { format } = require('internal/util/inspect');
 
 const hasOwnProperty = Object.prototype.hasOwnProperty;
 
@@ -134,7 +134,7 @@ const { UV_EOF } = internalBinding('uv');
 
 const { StreamPipe } = internalBinding('stream_pipe');
 const { _connectionListener: httpConnectionListener } = http;
-const debug = util.debuglog('http2');
+const debug = require('internal/util/debuglog').debuglog('http2');
 
 const kMaxFrameSize = (2 ** 24) - 1;
 const kMaxInt = (2 ** 32) - 1;
@@ -1087,7 +1087,7 @@ class Http2Session extends EventEmitter {
       localSettings: this.localSettings,
       remoteSettings: this.remoteSettings
     };
-    return `Http2Session ${util.format(obj)}`;
+    return `Http2Session ${format(obj)}`;
   }
 
   // The socket owned by this session
@@ -1663,7 +1663,7 @@ class Http2Stream extends Duplex {
       readableState: this._readableState,
       writableState: this._writableState
     };
-    return `Http2Stream ${util.format(obj)}`;
+    return `Http2Stream ${format(obj)}`;
   }
 
   get bufferSize() {