Fix #1492: systemd socket activation (PR #1494)
Fix #1492: systemd socket activation (PR #1494)

when starting up cherrypy via socket activation we
should not wait for the port to become free because
systemd is bound to it.
Safihre/cherrypy,Safihre/cherrypy,cherrypy/cherrypy,cherrypy/cheroot,cherrypy/cherrypy