When logging in from unix98 ptys, pam_securetty looks in
/etc/securetty to see if that terminal is allowed.  The
module looks at the part of the device after the last '/' to
match against the entry in /dev.  If users add 'pts/1' to
/etc/securetty this will not work.  The user must add '1' to
/etc/securetty as pam_securetty looks at only the part after
the last '/'.