tests: use g_new0 instead of VIR_ALLOC
tests: use g_new0 instead of VIR_ALLOC

Signed-off-by: Ján Tomko <4cab11cfb98d3c937327354a78eb07dbb6ee2bc6@redhat.com>
Reviewed-by: Pavel Hrdina <d4772d05997b8abf035041e3b4f4996380ea7e7a@redhat.com>

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