lxc: fuse: Stub out Slab bits in /proc/meminfo
lxc: fuse: Stub out Slab bits in /proc/meminfo

'free' on fedora23 wants to use the Slab field for calculated used
memory. The equation is:

used = MemTotal - MemFree - (Cached + Slab) - Buffers

We already set Cached and Buffers to 0, do the same for Slab and its
related values

https://bugzilla.redhat.com/show_bug.cgi?id=1300781

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