qemu: Reset hasManagedSave after removing a corrupted image

When starting a domain with managed save image, we try to restore it
first. If the image is corrupted, we silently unlink it and just
normally start the domain. At this point the domain has no managed save
image, yet we did not reset the hasManagedSave flag.

https://bugzilla.redhat.com/show_bug.cgi?id=1460962Signed-off-by: NJiri Denemark <jdenemar@redhat.com>

src/qemu/qemu_driver.c

@@ -7256,6 +7256,7 @@ qemuDomainObjStart(virConnectPtr conn,
             } else {
                 VIR_WARN("Ignoring incomplete managed state %s", managed_save);
                 priv->job.current->operation = op;
+                vm->hasManagedSave = false;
             }
         }
     }