Unify errors and exit codes of query commands

[pkratoch]

The behavior of query commands should be unified in these cases:

1. Output is empty because of e.g. no repositories are enabled.
2. Output is empty because the argument doesn't match anything.
3. Some arguments match, but some don't.

These commands currently in all the cases return exit code 0 and don't print any error message:

• advisory list
• advisory info
• environment list
• environment info
• group list
• group info
• repo list
• repo info
• repoquery
• copr list (considering only 1st case, since this command doesn't accept arguments)

These commands are different:

• module list and module info
  • exit code 0
  • in case there is an unmatched argument, it prints a message on stderr
• provides (considering only 2nd and 3rd case, since this command doesn't work without arguments)
  • exit code 1
  • in case there is an unmatched argument, it prints a message on stderr

Search is not included, as it's a little bit different. Similar is also repoquery. It might make sense for these to behave differently.

[pkratoch]

I am not sure about exit codes, but I think a message on stderr about unmatched arguments would be good in all cases. Not sure about repoquery, though.