Fix LOV striping code:

Fix LOV striping code:
- don't set default stripe count at lov_connect() time if it is zero, defer
  it to lov_create() time in case the number of OSTs has changed
- validate the "stripe width < 4GB" requirement at lov_create() time, in
  case bad user-specified striping patterns are given or #OSTs has increased
- don't override lsm_stripe_count if it is already set
- choose from all OSTs as the starting OST, instead of only [0-active]
- return -ENOTTY for unimplemented ioctls