rpc: improve error message for bounds check
If we exceed a fixed limit in RPC code we get a horrible message
like this, if the parameter type is a 'string', because we forgot
to initialize the error message type field:
$ virsh snapshot-list ostack1
error: too many remote undefineds: 1329 > 1024
It would also be useful to know which RPC call and field was
exceeded. So this patch makes us report:
$ virsh snapshot-list ostack1
error: too many remote undefineds: 1329 > 1024,
in parameter 'names' for 'virDomainSnapshotListNames'
Signed-off-by: NDaniel P. Berrange <berrange@redhat.com>
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