nscd cache location changed from /var/db/nscd to /var/cache/nscd
    
    The nscd policy module uses the old nscd cache location. The cache location
    changed with glibc 2.7-1, and the current nscd does place the files in
    /var/cache/nscd/.
    
    Signed-off-by: Manoj Srivastava <srivasta@debian.org>