gnome-keyring Better --replace behavior

[Stef Walter <stefw gnome org>]

Hey all,

I cleaned up the --replace behavior so it works as expected in certain
corner cases.

 * Try to use the control directory in the environment if present
   so that --replace can be sure to work with ssh and gpg agents.
 * Quit all daemons in session when --replace
 * Quiet things down when running with --replace, less complaining.

Anyone interested in trying this out or reviewing?

https://bugzilla.gnome.org/show_bug.cgi?id=681449

Cheers,

Stef