Fix Issues Related to Old VixDiskLib Symlink Workaround

The old c-language binding for VixDiskLib used a directory populated with symbolic links to appropriate versions of VixDiskLib-related libraries in the source directory /usr/lib/vmware-vix-disklib/lib64.  This request removes the changes to the smart_proxy_worker to set the LD_LIBRARY_PATH to the old directory, adds the correct LD_LIBRARY_PATH to the VixDiskLibServer process, and removes the glue code allowing the old C-language binding to be started.
@jrafanie @roliveri please review.