D-BUS SELinux support

I've implemented some basic SELinux access controls into the D-BUS
daemon to provide finer grained security on SELinux based systems. 
Currently access controls secure service acquisition and message sending
on the bus using a user space AVC.  Initial patch is attached, and also
posted at http://www.flux.utah.edu/~sds/dbus/.

The README file gives a basic overview of what the security enhancements
are doing.  Right now the code is still in a development stage.  There
is a lot of unnecessary overhead of context to sid switching, which I am
reworking currently.  I should have a new patch out early next week, but
for now I'd just like to get this out to hear any comments or
suggestions anyone might have.

--
Matthew Rickard
mjricka-FVV4AS6k8l2W8mdqIt43Ew@xxxxxxxxxxxxxxxx

se-dbus-0.2.diff
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dbus-flask-0.1.diff
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se-dbus-README
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