test: skip test-bindings if inspector is disabled

If node is configured --without-inspector/--without-ssl this test will
fail with the following error:
Path: inspector/test-bindings
inspector.js:8
  throw new Error('Inspector is not available');
  ^

Error: Inspector is not available
    at inspector.js:8:9
    at NativeModule.compile (bootstrap_node.js:549:7)

This commit skips this test if the inspector is disabled.

PR-URL: #13186
Reviewed-By: Rich Trott <rtrott@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Michael Dawson <michael_dawson@ca.ibm.com>
Reviewed-By: Eugene Ostroukhov <eostroukhov@google.com>
Reviewed-By: Richard Lau <riclau@uk.ibm.com>

test/inspector/test-bindings.js

@@ -1,5 +1,6 @@
 'use strict';
-require('../common');
+const common = require('../common');
+common.skipIfInspectorDisabled();
 const assert = require('assert');
 const inspector = require('inspector');
 const path = require('path');
@@ -81,7 +82,7 @@ function testSampleDebugSession() {
   }, TypeError);
   session.post('Debugger.enable', () => cbAsSecondArgCalled = true);
   session.post('Debugger.setBreakpointByUrl', {
-    'lineNumber': 11,
+    'lineNumber': 12,
     'url': path.resolve(__dirname, __filename),
     'columnNumber': 0,
     'condition': ''