pkglistgen: ignore bootstrap_copy repo

Never use the bootstrap_copy repo for package solving. Staging content
might be very different so don't confuse the solver.

pkglistgen/tool.py

@@ -578,7 +578,8 @@ def update_and_solve_target(self, api, target_project, target_config, main_repo,
                                 project, scope, force, no_checkout,
                                 only_release_packages, stop_after_solve):
         self.all_architectures = target_config.get('pkglistgen-archs').split(' ')
-        self.repos = self.expand_repos(project, main_repo)
+        ignore_repos = set(target_config.get('pkglistgen-ignore_repos', 'bootstrap_copy').split(' '))
+        self.repos = [ r for r in self.expand_repos(project, main_repo) if r[0] != project or r[1] not in ignore_repos ]
         print('[{}] {}/{}: update and solve'.format(scope, project, main_repo))
 
         group = target_config.get('pkglistgen-group', '000package-groups')