Add catapult/third_party/coverage to check_licenses test.

tools/checklicenses/checklicenses.py

 #!/usr/bin/env python
 # Copyright (c) 2012 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 """Makes sure that all files contain proper licensing information."""
 
 
 import json
 import optparse
@@ skipping 205 matching lines @@
     'third_party/catapult/third_party/apiclient': [
         'UNKNOWN',
     ],
 
     # https://bugs.launchpad.net/beautifulsoup/+bug/1481316
     # MIT license.
     'third_party/catapult/third_party/beautifulsoup': [
         'UNKNOWN'
     ],
 
+    # https://bitbucket.org/ned/coveragepy/issue/313/add-license-file-containing-2-3-or-4
+    # Apache (v2.0) license, not shipped
+    'third_party/catapult/third_party/coverage': [
+        'UNKNOWN'
+    ],
+
     # https://code.google.com/p/graphy/issues/detail?id=6
     # Apache (v2.0)
     'third_party/catapult/third_party/graphy': [
         'UNKNOWN',
     ],
 
     # https://github.com/GoogleCloudPlatform/gsutil/issues/305
     ('third_party/catapult/third_party/gsutil/gslib/third_party/'
      'storage_apitools'): [
         'UNKNOWN',
@@ skipping 489 matching lines @@
                            action='store_true',
                            default=False,
                            help='Ignore path-specific license whitelist.')
   option_parser.add_option('--json', help='Path to JSON output file')
   options, args = option_parser.parse_args()
   return check_licenses(options, args)
 
 
 if '__main__' == __name__:
   sys.exit(main())