pacman-key: use our option parser

The pacman-key script is complicated enough to warrent usage of the
parse_options script.  This is especially helpful in dealing with
all the configuration file override flags as the no longer need to
be specified first.  It also allows us to do the right thing early
with --help/--version and no option cases cleanly. This change also
makde the check for root privileges only occur on operations where
they are needed.

This patch is inspired by and supercedes some patches submitted by
Denis A. Altoé Falqueto and Ivan Kanakarakis who were altering the
previous option handling in an attempt to deal with the above issues.

Signed-off-by: Allan McRae <allan@archlinux.org>

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