tests: add test on virNetDevOpenvswitchInterfaceSetQos and virNetDevOpenvswitchInterfaceClearQos
tests: add test on virNetDevOpenvswitchInterfaceSetQos and virNetDevOpenvswitchInterfaceClearQos

Test virNetDevOpenvswitchInterfaceSetQos and
virNetDevOpenvswitchInterfaceClearQos with dryrun method.

Signed-off-by: zhangjl02 <93aaead8febf86bb49fc29aaae44e4159fb14a6a@inspur.com>
Signed-off-by: Michal Privoznik <83d82aaba2eed257f4814b0c239c260c4caaadf0@redhat.com>
Reviewed-by: Michal Privoznik <83d82aaba2eed257f4814b0c239c260c4caaadf0@redhat.com>

olafhering/libvirt,zippy2/libvirt,jfehlig/libvirt,nertpinx/libvirt,olafhering/libvirt,crobinso/libvirt,libvirt/libvirt,nertpinx/libvirt,olafhering/libvirt,olafhering/libvirt,libvirt/libvirt,nertpinx/libvirt,zippy2/libvirt,jfehlig/libvirt,jfehlig/libvirt,crobinso/libvirt,zippy2/libvirt,libvirt/libvirt,libvirt/libvirt,crobinso/libvirt,nertpinx/libvirt,jfehlig/libvirt,zippy2/libvirt,crobinso/libvirt,nertpinx/libvirt