Description of problem:

If you edit /etc/dnf/plugins/local.conf to set 'enabled = false' in the
[createrepo] section, dnf will constantly complain:

   Failed to synchronize cache for repo '_local' from 'file:///var/lib/dnf/plugins/local': Cannot download repomd.xml: Cannot download repodata/repomd.xml: All mirrors were tried, disabling.

It should be silent about this since this is a valid configuration.
As the comments in local.conf say, this is useful if you just want
to keep a copy of all packages you've updated to and so on (so that,
for example, you can roll back to previous package updates even though
Fedora has removed them from the repos, as Fedora does).

Version-Release number of selected component (if applicable):

python-dnf-plugins-extras-local-0.0.8-1.fc22.noarch
dnf-1.0.1-2.fc22.noarch

How reproducible:

100%

Steps to Reproduce:
1. 'dnf install python-dnf-plugins-extras-local'
2. immediately edit /etc/dnf/plugins/local.conf to set 'enabled = false'
   in the [createrepo] section
3. do any dnf operation, eg 'dnf check-update'. Watch the complaints.

Actual results:

Dnf complains with the error message above.

Expected results:

No complaints.