Asset.fingerprint() does not handle excludes correctly

[christophgysin]

When creating an asset from a directory with certain exclude options, the fingerprint does not change even if the files change.

Reproduction Steps

Add to packages/@aws-cdk/assets/test/fs/test.fs-fingerprint.ts

'considers negated exclude patterns for fingerprint'(test: Test) {
  // GIVEN
  const dir = fs.mkdtempSync(path.join(os.tmpdir(), 'fingerprint-tests'));
  const options = {path: dir, exclude: ['**', '!file.txt'], sourcePath: dir};

  // WHEN
  const f1 = libfs.fingerprint(dir, options);
  fs.writeFileSync(path.join(dir, 'file.txt'), 'data');
  const f2 = libfs.fingerprint(dir, options);

  // THEN
  test.notDeepEqual(f1, f2);
  test.done();
},

Error Log

AssertionError: 'c917eba4ddad2e97bec2e1c5607246911cb811be0f87131042791f5525f69575' notDeepEqual 'c917eba4ddad2e97bec2e1c5607246911cb811be0f87131042791f5525f69575'

Environment

• CLI Version : master
• Framework Version: master
• OS : linux
• Language : typescript

Other

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This is 🐛 Bug Report