tests: also skip qemuagenttest with old jansson
tests: also skip qemuagenttest with old jansson

qemuagenttest also depends on JSON object key ordering:
Invalid value of argument 'vcpus' of command 'guest-set-vcpus':
expected '[{"logical-id":1,"online":false}]' got '[{"online":false,"logical-id":1}]'

Skip it as well.

Signed-off-by: Ján Tomko <4cab11cfb98d3c937327354a78eb07dbb6ee2bc6@redhat.com>

olafhering/libvirt,olafhering/libvirt,eskultety/libvirt,andreabolognani/libvirt,zippy2/libvirt,jardasgit/libvirt,andreabolognani/libvirt,fabianfreyer/libvirt,eskultety/libvirt,libvirt/libvirt,fabianfreyer/libvirt,crobinso/libvirt,nertpinx/libvirt,nertpinx/libvirt,eskultety/libvirt,fabianfreyer/libvirt,libvirt/libvirt,andreabolognani/libvirt,jardasgit/libvirt,jardasgit/libvirt,jardasgit/libvirt,eskultety/libvirt,nertpinx/libvirt,olafhering/libvirt,nertpinx/libvirt,zippy2/libvirt,fabianfreyer/libvirt,zippy2/libvirt,crobinso/libvirt,fabianfreyer/libvirt,jfehlig/libvirt,nertpinx/libvirt,crobinso/libvirt,zippy2/libvirt,olafhering/libvirt,jardasgit/libvirt,jfehlig/libvirt,libvirt/libvirt,jfehlig/libvirt,jfehlig/libvirt,andreabolognani/libvirt,eskultety/libvirt,libvirt/libvirt,andreabolognani/libvirt,crobinso/libvirt