add --live support to "virsh dump"
This is trivial for QEMU since you just have to not stop the vm before starting the dump. And for Xen, you just pass the flag down to xend. * include/libvirt/libvirt.h.in (virDomainCoreDumpFlags): Add VIR_DUMP_LIVE. * src/qemu/qemu_driver.c (qemudDomainCoreDump): Support live dumping. * src/xen/xend_internal.c (xenDaemonDomainCoreDump): Support live dumping. * tools/virsh.c (opts_dump): Add --live. (cmdDump): Map it to VIR_DUMP_LIVE.
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