Ticket #47409 - allow setting db deadlock rejection policy
    
    https://fedorahosted.org/389/ticket/47409
    Reviewed by: nhosoi (Thanks!)
    Branch: master
    Fix Description: Fix coverity CID 11893 (#1 of 1): Unsigned compared against 0 (NO_EFFECT)
    val is u_int32_t which is never less than 0
    Platforms tested: RHEL6 x86_64
    Flag Day: no
    Doc impact: yes - document new config parameter