copr: don't try to list runtime dependencies

These are not necessarily other copr repositories, but rather any
(external) repositories.  We can not disable them "separately" by
'dnf copr disable', etc.  Printing them in 'dnf copr list' isn't
semantically correct.

Fixes: rhbz#1871373

plugins/copr.py

@@ -300,6 +300,10 @@ def _list_repo_file(self, repo_id, repo, enabled_only, disabled_only):
             # We skip multilib repositories
             return
 
+        if re.match('coprdep:.*', repo_id):
+            # Runtime dependencies are not listed.
+            return
+
         enabled = repo.enabled
         if (enabled and disabled_only) or (not enabled and enabled_only):
             return