Description of problem:
When running dnf update -y, dnf crashes with the following traceback:

[MIRROR] python3-setuptools-8.2.1-1.fc22.noarch.rpm: Downloading successfull, but checksum doesn't match. Expected: 878396225f11c5fb78123e655fdef3c6d53e44154fc3c6a0c48c4004dc0c8cc6(sha256)
[MIRROR] evolution-3.13.9-1.fc22.x86_64.rpm: Downloading successfull, but checksum doesn't match. Expected: 58ad942827ab53a434ffed55a5f216f4b29b3b37909b827bc5f4bf0b7400b6f3(sha256)
[MIRROR] evolution-3.13.9-1.fc22.x86_64.rpm: Downloading successfull, but checksum doesn't match. Expected: 58ad942827ab53a434ffed55a5f216f4b29b3b37909b827bc5f4bf0b7400b6f3(sha256)
[MIRROR] gnome-desktop3-3.15.3-1.fc22.x86_64.rpm: Downloading successfull, but checksum doesn't match. Expected: 3dc68216eaf1c95b6c4fb663838f0cc557a912ab14d6ec1fc4ef4710a1fee34e(sha256)
[MIRROR] python3-setuptools-8.2.1-1.fc22.noarch.rpm: Downloading successfull, but checksum doesn't match. Expected: 878396225f11c5fb78123e655fdef3c6d53e44154fc3c6a0c48c4004dc0c8cc6(sha256)
[MIRROR] python3-setuptools-8.2.1-1.fc22.noarch.rpm: Downloading successfull, but checksum doesn't match. Expected: 878396225f11c5fb78123e655fdef3c6d53e44154fc3c6a0c48c4004dc0c8cc6(sha256)
[MIRROR] gnome-desktop3-3.15.3-1.fc22.x86_64.rpm: Downloading successfull, but checksum doesn't match. Expected: 3dc68216eaf1c95b6c4fb663838f0cc557a912ab14d6ec1fc4ef4710a1fee34e(sha256)
[MIRROR] evolution-3.13.9-1.fc22.x86_64.rpm: Downloading successfull, but checksum doesn't match. Expected: 58ad942827ab53a434ffed55a5f216f4b29b3b37909b827bc5f4bf0b7400b6f3(sha256)
[MIRROR] evolution-3.13.9-1.fc22.x86_64.rpm: Downloading successfull, but checksum doesn't match. Expected: 58ad942827ab53a434ffed55a5f216f4b29b3b37909b827bc5f4bf0b7400b6f3(sha256)
Traceback (most recent call last):.x86_64.rpm                                0% [                                                                          ] 7.7 kB/s | 1.1 kB    241:18 ETA
  File "/usr/bin/dnf", line 36, in <module>
    main.user_main(sys.argv[1:], exit_code=True)
  File "/usr/lib/python2.7/site-packages/dnf/cli/main.py", line 182, in user_main
    errcode = main(args)
  File "/usr/lib/python2.7/site-packages/dnf/cli/main.py", line 84, in main
    return _main(base, args)
  File "/usr/lib/python2.7/site-packages/dnf/cli/main.py", line 141, in _main
    ret = resolving(cli, base)
  File "/usr/lib/python2.7/site-packages/dnf/cli/main.py", line 160, in resolving
    base.do_transaction()
  File "/usr/lib/python2.7/site-packages/dnf/cli/cli.py", line 208, in do_transaction
    total_cb)
  File "/usr/lib/python2.7/site-packages/dnf/base.py", line 846, in download_packages
    errors = dnf.repo.download_payloads(payloads, drpm)
  File "/usr/lib/python2.7/site-packages/dnf/repo.py", line 125, in download_payloads
    librepo.download_packages(targets, failfast=True)
  File "/usr/lib64/python2.7/site-packages/librepo/__init__.py", line 1489, in download_packages
    return _librepo.download_packages(list, failfast)
  File "/usr/lib/python2.7/site-packages/dnf/util.py", line 144, in new_func
    name = '%s.%s' % (args[0].__class__.__name__, fn.__name__)
  File "/usr/lib/python2.7/site-packages/dnf/repo.py", line 318, in _progress_cb
    self.progress.progress(self, done)
  File "/usr/lib/python2.7/site-packages/dnf/cli/progress.py", line 69, in progress
    text = unicode(payload)
  File "/usr/lib/python2.7/site-packages/dnf/util.py", line 144, in new_func
    name = '%s.%s' % (args[0].__class__.__name__, fn.__name__)
  File "/usr/lib/python2.7/site-packages/dnf/repo.py", line 318, in _progress_cb
    self.progress.progress(self, done)
  File "/usr/lib/python2.7/site-packages/dnf/cli/progress.py", line 69, in progress
    text = unicode(payload)
  File "/usr/lib/python2.7/site-packages/dnf/util.py", line 144, in new_func
    name = '%s.%s' % (args[0].__class__.__name__, fn.__name__)
  File "/usr/lib/python2.7/site-packages/dnf/util.py", line 146, in new_func
    return fn(*args, **kwargs)
  File "/usr/lib/python2.7/site-packages/dnf/repo.py", line 315, in _mirrorfail_cb
    self.progress.end(self, dnf.callback.STATUS_MIRROR, err)
  File "/usr/lib/python2.7/site-packages/dnf/cli/progress.py", line 148, in end
    msg = '%s%-*s\n' % (msg, left, err_msg)
UnicodeDecodeError: 'ascii' codec can't decode byte 0xc3 in position 197: ordinal not in range(128)


Version-Release number of selected component (if applicable):
# dnf --version
0.6.3
  Nainstalováno: dnf-0:0.6.3-2.fc22.noarch na 2014-12-16 18:55
  Sestaveno    : Fedora Project na 2014-12-09 14:04

  Nainstalováno: rpm-0:4.12.0.1-5.fc22.x86_64 na 2014-12-16 18:40
  Sestaveno    : Fedora Project na 2014-12-12 16:21



How reproducible:
Dos not happen every update attempt, so it is either caused by some specific repository (meta)data state or caused by a race condition.


Steps to Reproduce:
1. dnf clean all
2. dnf update -y

Actual results:
dnf racebacks

Expected results:
dnf finishes the update

Additional info:
# locale
LANG=cs_CZ.utf8
LC_CTYPE="cs_CZ.utf8"
LC_NUMERIC="cs_CZ.utf8"
LC_TIME="cs_CZ.utf8"
LC_COLLATE="cs_CZ.utf8"
LC_MONETARY="cs_CZ.utf8"
LC_MESSAGES="cs_CZ.utf8"
LC_PAPER="cs_CZ.utf8"
LC_NAME="cs_CZ.utf8"
LC_ADDRESS="cs_CZ.utf8"
LC_TELEPHONE="cs_CZ.utf8"
LC_MEASUREMENT="cs_CZ.utf8"
LC_IDENTIFICATION="cs_CZ.utf8"
LC_ALL=