Bug 1416782

Description of problem:
When dnf repoclosure finds unsatisfied dependencies in a repo, it prints the result, but the command still exits with 0, so it is hard to determine the result in scripts. Yum repoclosure exited with 1 in such case

Version-Release number of selected component (if applicable):
$ dnf repoclosure --version
2.0.0
$ rpm -q python3-dnf-plugins-extras-repoclosure
python3-dnf-plugins-extras-repoclosure-0.10.0-0.2rc1.fc26.noarch

How reproducible:
Always

Steps to Reproduce:
1. Copy any RPM (with at least one dependency) into a new directory.
2. Run createrepo_c .
3. Run dnf repoclosure --repofrompath=my-repo,file://$(pwd) --repo=my-repo
4. It should print info about unresolved deps
5. Run echo $?

Actual results:
It exits with 0.

Expected results:
It should exit with some other code.

Additional info:
Using yum repoclosure prints the same information, but exits with 1.

$ repoclosure --repofrompath=my-repo,file://$(pwd) --repoid=my-repo
$ echo $?
1