trunk: Unified labeled networking policy from Paul Moore.
    
    The latest revision of the labeled policy patches which enable both labeled 
    and unlabeled policy support for NetLabel.  This revision takes into account
    Chris' feedback from the first version and reduces the number of interface
    calls in each domain down to two at present: one for unlabeled access, one for
    NetLabel access.  The older, transport layer specific interfaces, are still  
    present for use by third-party modules but are not used in the default policy
    modules.
    
    trunk: Use netmsg initial SID for MLS-only Netlabel packets, from Paul Moore.
    
    This patch changes the policy to use the netmsg initial SID as the "base"
    SID/context for NetLabel packets which only have MLS security attributes.
    Currently we use the unlabeled initial SID which makes it very difficult to
    distinquish between actual unlabeled packets and those packets which have MLS
    security attributes.