tests: qemuxml2xml: make GIC handling optional
tests: qemuxml2xml: make GIC handling optional

Make all users of GIC_X use ARG_GIC explicitly, and drop the
required gic parameter from DO_TEST_FULL

Reviewed-by: Andrea Bolognani <3ada0bee826c753786fdbba72243dfba997094cf@redhat.com>
Signed-off-by: Cole Robinson <7cd45ff6ad1fb7cf556a02797d774247851499f8@redhat.com>

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