security/trousers: Fix tcsd.conf permissions

It turns out that tcsd requires the ownership of tcsd.conf file to be
set to root:_tss.  See trousers-0.3.14_3/src/tcsd/tcsd_conf.c for
details. Otherwise, tcsd fails:

    # service tcsd start
    Starting tcsd.
    /usr/local/etc/rc.d/tcsd: WARNING: failed to start tcsd
    # tail /var/log/messages
    Nov  4 11:24:43 x TCSD[1298]: TrouSerS ERROR: TCSD config file (/usr/local/etc/tcsd.conf) must be user/group root/_tss
    Nov  4 11:24:43 x 0mp[2372]: /usr/local/etc/rc.d/tcsd: WARNING: failed to start tcsd

Also, the mode of the configuration file has to be 640.

PR:		253858
Reported by:	unitrunker <unitrunker@gmail.com>
Approved by:	maintainer timeout, portmgr blanket (runtime error)
Sponsored by:	Klara, Inc.