pacman-key: remake of --reload command

The --reload command was refactored to allow a more flexible management.
There are two sets of keys that will be added, one that will be
removed and one that will be kept.

The set of keys to be kept are configured in pacman.conf, with the
option HoldKeys, with the same meaning of HoldPkgs. It can be repeated
and several values can be put in the same entry.

The new behavior allows a key to be marked for removal, but the user
can decide if that key must be kept. For example, if a developer has
a public repository, signed with his own key, that key must be added
to the HoldKeys option. If the key is marked for removal from pacman's
keyring, it will not be removed for the users that have configured
HoldKeys correctly.

There are other minor fixes, mainly in the handling of --add command
when there is no aditional parameter. In that case, pacman-key will
behave just like gpg, adding the contents of stdin into pacman's keyring.

Signed-off-by: Denis A. Altoé Falqueto <denisfalqueto@gmail.com>

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