Use correct command line parser

Testing/SystemTests/scripts/InstallerTests.py

@@ -22,8 +22,8 @@ parser.add_argument('-R', dest='test_regex', metavar='regexp', default=None,
                     help='Optionally only run the test matched by the regex')
 parser.add_argument('--archivesearch', dest='archivesearch', action='store_true',
                     help='Turn on archive search for file finder')
-parser.add_option("", "--exclude-in-pull-requests", dest="exclude_in_pr_builds",action="store_true",
-                  help="Skip tests that are not run in pull request builds")
+parser.add_argument('--exclude-in-pull-requests', dest="exclude_in_pr_builds",action="store_true",
+                    help="Skip tests that are not run in pull request builds")
 log_levels = ['error', 'warning', 'notice', 'information', 'debug']
 parser.add_argument('-l', dest='log_level', metavar='level', default='notice',
                     choices=log_levels, help='Log level '+str(log_levels))