[tac_plus] Patch for tac_plus to fix the -G option

[Nathan Schrenk]

Attached is a patch against version F4.0.4.15 of the tacacs+ package
that fixes support for the -G command-line option.  My understanding
of -G is that it is supposed to keep tac_plus running in the
foreground: no forking, no detaching from the tty, etc.  The code in
the F4.0.4.15 distribution does not do this: it forks and detaches.

Thanks,

Nathan Schrenk
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