qemu: Allow making vcpus hotpluggable with virDomainSetVcpusFlags
qemu: Allow making vcpus hotpluggable with virDomainSetVcpusFlags

Implement support for VIR_DOMAIN_VCPU_HOTPLUGGABLE so that users can
choose to make vcpus added by the API removable.

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