Ticket #508 - part 1 - lock-free access to FrontendConfig structure
    
    https://fedorahosted.org/389/ticket/508
    Reviewed by: mreynolds (Thanks!)
    Branch: master
    Fix Description: Change the thread contested integral values to use
    lock free get and set.  This includes the 3 INT types and all of the
    ON/OFF types.  These have been changed to use atomic variables used by
    the PR_Atomic APIs.
    Platforms tested: RHEL6 x86_64
    Flag Day: no
    Doc impact: no