core: Don't exclude modular packages

For now, we don't natively support modules. But we still want to be able
to install modular packages if the repos are enabled, but libdnf
automatically filters them out. So for now, let's tell libdnf that we do
want to be able to see them.

Related: #1435

src/libpriv/rpmostree-core.c

@@ -1159,6 +1159,12 @@ rpmostree_context_download_metadata (RpmOstreeContext *self,
     g_signal_handler_disconnect (hifstate, progress_sigid);
   }
 
+  /* For now, we don't natively support modules. But we still want to be able to install
+   * modular packages if the repos are enabled, but libdnf automatically filters them out.
+   * So for now, let's tell libdnf that we do want to be able to see them. See:
+   * https://github.com/projectatomic/rpm-ostree/issues/1435 */
+  dnf_sack_set_module_excludes (dnf_context_get_sack (self->dnfctx), NULL);
+
   return TRUE;
 }