Disable modular repos for Rawhide upgrades to avoid #2228827

As 'real' upgrades (using releases/development/rawhide on the
mirrors) do not hit this bug because it has a stale Modular
tree, it makes sense to work around the bug in testing so we can
see if upgrades are broken in any *other* way.

Signed-off-by: Adam Williamson <awilliam@redhat.com>

tests/upgrade_run.pm

@@ -18,7 +18,7 @@ sub run {
     repo_setup();
     my $params = "-y --releasever=${relnum}";
     if ($release eq "rawhide") {
-        $params .= " --nogpgcheck";
+        $params .= " --nogpgcheck --disablerepo=*modular*";
     }
 
     if (script_run "dnf ${params} system-upgrade download", 6000) {