Update to 0.8.4
    
    Sync with Fedora's specfile and make it work on EPEL 7
    Explicitly specify 'python2' wherever calling the python
      interpreter
    Correctly handle Fedora 28 modular layout
      https://github.com/fedora-infra/mirrormanager2/pull/242
    Use "site", "host" and "mirror" consistently
      https://github.com/fedora-infra/mirrormanager2/pull/241
    crawler: support https only hosts
      https://github.com/fedora-infra/mirrormanager2/pull/240
    Make mm2_get_internet2_netblocks work again
      https://github.com/fedora-infra/mirrormanager2/pull/234
    crawler: use timeout also on rsync crawls
      https://github.com/fedora-infra/mirrormanager2/pull/229
    Fix existing test cases and re-enable tests on commits
    Enable tests in the %check section
    publiclist: hide disabled arches and products
      https://github.com/fedora-infra/mirrormanager2/pull/223