Add missing managing hosts filtering options
    
    Host object has a virtual attribute "managing" containing all hosts
    it manages (governed by managedBy attribute). This patch also adds
    standard membership filtering options:
      --man-hosts=HOSTS: Only hosts managing _all_ HOSTS are returned
      --not-man-hosts=HOSTS: Only hosts which do not manage _any_ host
        in HOSTS are returned
    
    https://fedorahosted.org/freeipa/ticket/1675