[devtools] fix bashism in xvfb-run.sh
bash's trap builtin accepts SIGUSR1, whereas dash complains. So use USR1 instead.
# -*- coding: utf-8 -*-# copyright %(year)s %(author)s, all rights reserved.# contact %(author-web-site)s -- mailto:%(author-email)s#%(long-license)s"""%(distname)s repository side views, usually for notification"""