vz: cleanup: remove unused constant
vz: cleanup: remove unused constant

PARALLELS_STATISTICS_DROP_COUNT isn't used anymore

Signed-off-by: Maxim Nestratov <3521c777060d1ad4ae08bba7eb9d80264eaeb236@virtuozzo.com>

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