include: Add new "group_name" definition for iotune throttling
include: Add new "group_name" definition for iotune throttling

Add the new field to support sharing I/O throttling quota between
multiple drives.

Signed-off-by: John Ferlan <87558058f6f829e5ec976c8ef960720af4ff9c7d@redhat.com>

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