tests/kola: remove dtb exceptions in upgrade test SELinux checks

Fixes coreos/fedora-coreos-tracker#1808

tests/kola/upgrade/extended/test.sh

@@ -206,8 +206,6 @@ selinux-sanity-check() {
             # Add in a few temporary glob exceptions
             # https://github.com/coreos/fedora-coreos-tracker/issues/1806
             [[ "${path}" =~ /etc/selinux/targeted/active/ ]] && continue
-            # https://github.com/coreos/fedora-coreos-tracker/issues/1808
-            [[ "${path}" =~ /boot/ostree/.*/dtb ]] && continue
             if [[ "${exceptions[$path]:-noexception}" == 'noexception' ]]; then
                 echo "Unexpected mislabeled file found: ${path}"
                 found="1"
@@ -232,6 +230,9 @@ if vereq $version $target_version; then
     if ! echo "$state" | grep -q "CoreOS aleph version"; then
         fatal "check bootupctl status output"
     fi
+    # cleanup the rollback, or will hit wrong dtb selinux label for old deployment
+    # https://github.com/coreos/fedora-coreos-tracker/issues/1808
+    rpm-ostree cleanup -r
     # One last check!
     selinux-sanity-check
     exit 0