qemu: Generalize APPEND macro in qemuMonitorJSONSetMigrationParams
qemu: Generalize APPEND macro in qemuMonitorJSONSetMigrationParams

The APPEND macro is now be usable for any type.

Signed-off-by: Jiri Denemark <62bdf77dc47919a4d59a91822129d14633cfca81@redhat.com>
Reviewed-by: John Ferlan <87558058f6f829e5ec976c8ef960720af4ff9c7d@redhat.com>

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