[libvirt] [Test] Add API to tunnel channels

[John Eckersberg]

Attached is a simple test program to exercise virDomainOpenChannel that
echoes a toupper()'d string and exits.  Edit the #defines as necessary
to match your setup.  You'll need a channel defined in the guest similar
to:

    <channel type="unix">
      <source mode="bind" path="/tmp/guestfsd.sock"/>
      <target type="virtio" name="org.libguestfs.channel.0"/>
    </channel>

Run the test, and then inside of the VM, you should be able to:

    [root at f17-minimal ~]# socat - /dev/virtio-ports/org.libguestfs.channel.0
    hello world
    HELLO WORLD
    [root at f17-minimal ~]#

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