qemu: managedsave: Check that VM is alive after entering async job
qemu: managedsave: Check that VM is alive after entering async job

Saving a shutoff VM doesn't make sense and libvirtd crashes while
attempting to do that. Check that the domain is alive after entering
the save async job.

Resolves: https://bugzilla.redhat.com/show_bug.cgi?id=1129207

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