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Description
As qemu-kvm and libvirt don't support sdl.refer Bug 633326 - Fails to reject unsupported graphics type such as 'sdl',the type sdl should be removed from the error info when set 2 vnc or spice graphics

Version:
libvirt-0.10.2-36.el6.x86_64

How reproducible:
100%

Steps to Reproduce:
1.Prepare a guest,edit the xml to add 2 vnc or spice graphics as below:
    <graphics type='vnc' port='-1' autoport='yes'/>
    <graphics type='vnc' port='-1' autoport='yes'/>

2.Try to boot the guest,error shows as below,unsupported type sdl is included there.
As qemu-kvm and libvirt don't support sdl.refer Bug 633326 - Fails to reject unsupported graphics type such as 'sdl',the type sdl should be removed from the error info.
# virsh start demotest
error: Failed to start domain demotest
error: unsupported configuration: only 1 graphics device of each type (sdl, vnc, spice) is supported

Actual results：
sdl is included in the error info in step 2.

Expected results:
sdl is not included in the error info in step 2.

Additional info:
On rhel7,qemu-kvm doesn't provide support sdl,refer to bug 1049813,the issue can also be reproduced on rhel7.

You are conflating support in libvirt with support in KVM. A software collection or add-on project like RDO may ship a different KVM binary from the one in base-RHEL that *does* have SDL support included. So it is not appropriate to change this in libvirt.