Remove use of storagePrivateData from storage driver
Remove use of storagePrivateData from storage driver

The shared storage driver is stateful and inside the daemon so
there is no need to use the storagePrivateData field to get the
driver handle. Just access the global driver handle directly.

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