[Drbd-dev] [DRBD 8.0 PATCH] Update state processing so that after-state-change is always done in worker thread

[Graham, Simon]

This patch updates the state processing so that the after state change
processing is always done on the worker thread - my main motivation for
this was to ensure that state change notifications are never re-ordered.


This also involves the following:
1. starting the worker thread is done inline in drbd_set_state
2. the worker will be started whenever it is needed rather than
   only when certain states are reached.
3. Marking the meta data dirty is done inline in drbd_set_state

Simon
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