replace PolicyKit with resmgr

[Artem Kachitchkine]

Can't say about replacement, but I like the idea of a single API that HAL uses 
to retrieve privileges, regardless to how these privileges are really stored and 
managed. The issue of device permissions/ACLs is largely irrelevant, because 
that's just one of many ways to store privileges. Currently polkitd stores 
privileges in text files - I think a resmgr backend could be hooked up instead.

The notion of 'temporary' I think (might be mistaken) means it only exists in 
polkitd's memory, not written back to the privilege backing store. Such 
privileges can be revoked without relogging in or even restarting the privileged 
process.

Initial HAL integration in Solaris will probably not use polkitd at all, only 
the libpolkit with static privileges from the text files (though the D-BUS stuff 
that creeped in recently will need to be patched). We also don't use 
pam-console. Even in this stripped down configuration HAL automatic mounting 
will work fine. This is the kind of mix-and-match flexibility I like to maintain 
with the libpolkit API.

-Artem.