[feature] Behavior of one time ticket lock-out is configurable.
Two new robot parameters were introduced: * one_time_ticket_lockout: - "one_time" won't allow access again. This is previous behavior. - "remote_addr" will lock the ticket on remote address accessed at first time. - "open" will never lock-out tickets. * one_time_ticket_lifetime: Duration before ticket expires. Default is "2d", previous hardcoded value. git-svn-id: https://subversion.renater.fr/sympa/branches/sympa-6.2-branch@11068 05aa8bb8-cd2b-0410-b1d7-8918dfa770ce