- fixed typos in comments and some alingment in cobd.

- fixed typos in comments and some alingment in cobd.
- added canceling unused locks before disconnecting master/cache exports in cobd_iocontrol()

- added lmv_cancel_unused() to cancel unused locks from llite correctly instead of using
direct ldlm_cli_cancel_unused() on lmv namespace.

- removed not used ll_mdc_cancel_unused()