http2: request.socket|connection

Support the socket/connection getter like require('http') does.

PR-URL: #130
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>

lib/internal/http2/compat.js

@@ -178,6 +178,14 @@ class Http2ServerRequest extends Readable {
     return '2.0';
   }
 
+  get socket() {
+    return this.stream.session.socket;
+  }
+
+  get connection() {
+    return this.socket;
+  }
+
   _read(nread) {
     var stream = this[kStream];
     if (stream) {

test/parallel/test-http2-compat-serverrequest.js

@@ -3,6 +3,7 @@
 const common = require('../common');
 const assert = require('assert');
 const h2 = require('http2');
+const net = require('net');
 
 // Http2ServerRequest should expose convenience properties
 
@@ -22,6 +23,10 @@ server.listen(0, common.mustCall(function() {
     assert.strictEqual(request.httpVersionMajor, expected.httpVersionMajor);
     assert.strictEqual(request.httpVersionMinor, expected.httpVersionMinor);
 
+    assert.ok(request.socket instanceof net.Socket);
+    assert.ok(request.connection instanceof net.Socket);
+    assert.strictEqual(request.socket, request.connection);
+
     response.stream.on('finish', common.mustCall(function() {
       server.close();
     }));