qemu: Create common code for JSON "query-block" call
Reduce some cut-n-paste code by creating common helper. Make use of the
recently added virJSONValueObjectStealArray to grab the devices list as
part of the common code (we we can Free the reply) and return devices for
each of the callers to continue to parse.
NB: This also adds error checking to qemuMonitorJSONDiskNameLookup
Signed-off-by: NJohn Ferlan <jferlan@redhat.com>
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