qemu: Add flags to qemuMigrationWaitForCompletion
qemu: Add flags to qemuMigrationWaitForCompletion

The function already takes two bool arguments, switching to flags makes
it a lot easier to read. Especially in case we need to add another
boolean in the future.

Signed-off-by: Jiri Denemark <62bdf77dc47919a4d59a91822129d14633cfca81@redhat.com>

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