virsh: migrate: Don't disallow --p2p and --migrateuri
virsh: migrate: Don't disallow --p2p and --migrateuri

Because it's a valid combination. p2p still uses a separate channel
for qemu migration, so there's value in letting the user specify a manual
migrate URI for overriding auto-port, or libvirt's FQDN lookup.

What _isn't_ allowed is --migrateuri and TUNNELLED, since there is
no separate migration channel. Disallow that instead

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