Tools for monitoring a message bus

...with the intention of triggering an immediate compose.

Overview: rpm-ostree-build-monitor connects to a qpid
message bus, listening for a user-specified (via .ini file)
event, and triggering a (user-specified) command. Since
the message bus in question requires Kerberos authentication,
a helper script runs via systemd timer and keeps a krb5cc
cache file topped up.
Fix path to default config file

/etc/rpm-ostree.conf -> rpm-ostree-toolbox.ini

Because the former isn't in our namespace, and the .ini
extension is more appropriate. This isn't used in reality,
because we get invoked by systemd with -c PATH, but we
don't like to mislead readers
packaging: s/ostree/unprivileged/

Cosmetic, but this isn't about ostree, it's about having an
unprivileged user.
Move kinit/build-monitor under -toolbox namespace

There are 3 levels here:

ostree
rpm-ostree
rpm-ostree-toolbox

Scripts here should be cleanly inside this package's namespace.  Ok,
it's minor, but my OCD is intervening...