PR#2910: Hosts page with more filters and added channel column
    
    Merges #2910
    https://pagure.io/koji/pull-request/2910
    
    Fixes: #1423
    https://pagure.io/koji/issue/1423
    [RFE] www hosts page 1:1 with list-hosts
    
    Fixes: #827
    https://pagure.io/koji/issue/827
    [RFE] Web page listing hosts, could show channels