Ignore "Solo5: Halted" when testing "quiet mode"
Ignore "Solo5: Halted" when testing "quiet mode"

This message is deliberately always produced on virtio hypervisors other
than QEMU, so ignore it here.

Weichen81/solo5,djwillia/solo5,Solo5/solo5,mato/solo5,djwillia/solo5,Weichen81/solo5,Solo5/solo5,djwillia/solo5,mato/solo5,Weichen81/solo5,mato/solo5