Description of problem:
RHEL 7.4 host with qemu-kvm-rhev contains all the bits needed to make spice Folder Sharing feature to work. To make oVirt/RHV support it, we need to add a spice port channel to <devices> element of domain XML:
    <channel type='spiceport'>
        <source channel='org.spice-space.webdav.0'/>
        <target type='virtio' name='org.spice-space.webdav.0'/>
    </channel>
and UI to control that in Edit VM dialog.

Version-Release number of selected component (if applicable):
4.1

How reproducible:


Steps to Reproduce:
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Actual results:


Expected results:


Additional info:
RHEL client & guest support won't come till phodav library is included in el7 (bug 1462813) but that's not relevant for oVirt at all and RHV can also support this feature even when phodav misses RHEL 7.5.