admin: Prepare admin protocol for future worker related procedures
admin: Prepare admin protocol for future worker related procedures

Before any getter or setter methods can be introduced, first specify a set of
public attributes/flags that these methods will be compatible with.

Signed-off-by: Erik Skultety <2c14d38fa47c8799f1b9c16280abe27f8edfec6e@redhat.com>

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