gather: Mark repos as containing module hotfixes

This should prevent DNF from doing any unwanted magic with the contents.
Ideally we want it to completely ignore the modular metadata in there,
but there seems to be no way to do that.

This should at least prevent it from hiding non-modular packages that
are masked by some default stream.

Fixes: https://pagure.io/pungi/issue/1241
Signed-off-by: Lubomír Sedlář <lsedlar@redhat.com>

pungi/dnf_wrapper.py

@@ -59,6 +59,7 @@ class DnfWrapper(dnf.Base):
             baseurl=[baseurl],
             enabledgroups=enablegroups,
             priority=10 if lookaside else 20,
+            module_hotfixes=True,
         )