tests: Test --channel none

tests/cli-test-xml/compare/virt-install-singleton-config-1.xml

@@ -47,13 +47,6 @@
     </controller>
     <input type="tablet" bus="usb"/>
     <graphics type="spice" port="-1" tlsPort="-1" autoport="yes"/>
-    <channel type="unix">
-      <source mode="bind"/>
-      <target type="virtio" name="org.qemu.guest_agent.0"/>
-    </channel>
-    <channel type="spicevmc">
-      <target type="virtio" name="com.redhat.spice.0"/>
-    </channel>
     <video>
       <model type="vga"/>
     </video>

tests/clitest.py

@@ -471,6 +471,7 @@ c.add_compare(""" \
 \
 --disk none \
 --console none \
+--channel none \
 --network none \
 --controller usb2 \
 --graphics spice \