qemu: agent: Differentiate errors when the agent channel was hotplugged
When the guest agent channel gets hotplugged to a VM, libvirt would still report that "QEMU guest agent is not configured" rather than stating that the connection was not established yet. Currently the code won't be able to connect to the agent after hotplug but that will change in a later patch. As the qemuFindAgentConfig() helper is quite helpful in this case move it to a more usable place and export it.
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