N-way mirror read speedup in zfsonlinux

[Steven Hartland]

Ok so latest version attached with the following changes:
* Switched from d_nonrotating -> d_rotation_rate for more flexibility
  in the future.
* Added g_handleattr_uint16_t to correctly handle uint16_t without
  hard coding size.
* Switched back to for() {...} from do {..} while()
* Added non_rotating_seek_inc option for controlling the seek increment
  for non rotating media.

    Regards
    Steve

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