fsm: allow graceful exit on FSM termination

The function _osmo_fsm_inst_term() terminates all child FSMs befor
it calls fi->fsm_cleanup(). This prevents the cleanup callback to
perform last actions on the child FSMs (e.g.
osmo_fsm_inst_unlink_parent()).

- Since moving the cleanup callack to the beginning of the function
  would alter the termination behavior and possibly cause malfunction
  in already existing implementation that use OSMO fsm, a new
  optional callback that is called immediately at the beginning of
  the terminatopn process is added.

Change-Id: I0fdda9fe994753f975a658c0f3fb3615949cc8bb
Closes: OS#2915

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